Turn Signal Problems and Diagnosis

Updated on March 5, 2019
Dan Ferrell profile image

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology.

Turn signals can fail in many ways.
Turn signals can fail in many ways. | Source

Turn signal problems, and diagnosis can get confusing. Especially when a system shares wires and connections with the parking, warning, and braking light systems.

Most common problem sources include bulbs, wires, connectors, fuses, flasher units, and switches. So the average car owner can troubleshoot these faults with the use of a test light and, sometimes, a digital multimeter (DMM).

When dealing with any vehicle electrical circuit fault, it's a good idea to have the repair manual for the particular vehicle make and model you'll be working on. It helps you identify not only wires and components and their related connections, but how to access, troubleshoot and replace components, as necessary.

Furthermore, sometimes it is necessary to access the turn signal switch. You'll have to remove covers and, possibly, the steering wheel. If your vehicle has airbags, it is necessary to disable the passive restraint system (airbags) before working around the switch to prevent accidentally hitting an inertia sensor that may activate the airbags.

Always follow the instructions and warnings in the repair manual for your particular model to prevent an accident. Haynes manuals are popular and practical maintenance and troubleshooting guides. Get the one for your car make and model.

To make troubleshooting easier, this guide is divided into the most common types of turn signal system failures, troubleshooting procedures, and tips to guide you toward the potential fault much faster. Just look for the section heading that describes your particular problem.

Index
I. One of My Turn Signals Doesn't Work
Checking a Light Bulb Socket for Ground and Power
II. One Side of the Turn Signal Lights Doesn't Work
III. My Hazard Lights Don't Work But the Turn Signals Do
IV. Turn Lights Flash Too Fast or Slow
V. Turn Signal Lights Don't Work
VI. Turn Signals Don't Flash
VII. Turn Indicators on Dash Don't Flash
VIII. Turn Indicators Don't Work But Turn Signals Do
IX. Checking the Turn Signal Switch
X. Testing the Turn Signal Flasher
XI. Turn Lights Don't Turn Off
Check all turn lights when troubleshooting the turn signals.
Check all turn lights when troubleshooting the turn signals. | Source

I. One of My Turn Signals Doesn't Work

This is one of the most common faults in turn signal systems. Here are some steps you can take to troubleshoot the problem:

  1. First, check the bulb. You'll need to gain access to the bulb through the engine compartment (front light), trunk (rear light) or by removing the lens itself. Access changes depending on model. If necessary, consult your vehicle repair manual.
  2. Most likely, the turn signal bulb is a two-filament type. Make sure both filaments are in good condition, and that the bulb glass is not darkened. Otherwise, replace the bulb with another one of the same type and wattage.
  3. Examine the bulb socket for corrosion or damage.
  4. If necessary, check the socket ground and power connections. See the next section.

Light bulbs can wear out and stop working.
Light bulbs can wear out and stop working. | Source

Checking a Light Bulb Socket for Ground and Power

You can use a test light here:

  1. After removing the bulb, clip the test light to the socket wall (ground) and touch each socket contact inside with the tip of the test light.
  2. Have an assistant operate the turn signal. The test light should flash—otherwise, there something wrong with the ground or power connections.
  • Connect your test light to a good chassis ground. A bolt or unpainted metal bracket will do.
  • Then touch the socket contacts with your test light tip and have your assistant operate the turn lights. The test light should flash. If it does, check the ground connection at the socket.
  • If the test light didn't flash, connect your test light to battery power and touch the socket wall (ground) with the tip of the test light. Your test light should illuminate. If it does, check and repair the power source connection at the socket.

One turn signal can fail in a turn signal system.
One turn signal can fail in a turn signal system. | Source

II. One Side of the Turn Signal Lights Doesn't Work

This is a variation of the previous problems. This time, though, the left or right side of the signals doesn't work. You may see the dash indicator lamps illuminating brightly, but the turn lights won't flash.

You may be dealing with bad bulbs or a fault between that side of the circuit and the turn signal switch itself.

  1. First, check the bulbs to see if they are still in good shape: No darkened areas or damaged filaments.
  2. Then, check the sockets for corrosion, wear or damage.
  3. Confirm the ground and power connections are working properly. Refer to the 'Checking a Light Bulb Socket for Ground and Power.'
  4. Finally, check the part of the switch that operates that side of the turn signal using your test light or digital multimeter. Refer to the section 'Checking the Turn Signal Switch.' You may be dealing with an electrical open or a switch failure.

Check that your hazard lights work when troubleshooting your turn signals.
Check that your hazard lights work when troubleshooting your turn signals. | Source

III. My Hazard Lights Don't Work But the Turn Signals Do

The hazard or emergency lights may share the same circuit with the turn signal circuit.

  1. When your hazard lights don't illuminate but the turn signals work, usually you are dealing with a faulty hazard-lights flasher.
  2. However, if the flasher unit is working fine, check the fuse.
  3. Also, check for a bad connection at the turn signal switch or an open in the part of the circuit that connects the flasher unit to the turn signal switch. See the section 'Checking the Turn Signal Switch.'
  4. Finally, check for an electrical open or a short circuit in the wiring that connects to the external lights.

IV. Turn Lights Flash Too Fast or Slow

A change in the flashing rate of the turn signal lights isn't common but it can happen.

  • If this occurred after replacing the flasher or one of the light bulbs, you may have installed the wrong type of flasher or bulb for your vehicle model.
  • Or one of your light bulbs may have burned out. A burned-out bulb can cause the indicator light to flash faster.

Other potential problems that may lead to a change in the flashing rate:

  • Poor ground or power connection at the lamps.
  • A loose connection at the turn signal switch.
  • If the lights are flashing faster than normal, make sure the alternator is not overcharging the battery.
  • If the lights are flashing slower than normal, the alternator may have an undercharge condition, or your battery may be undercharged.

V. Turn Signal Lights Don't Work

Another common problem occurs when none of the turn signal lights work.

Note: Normally, you are dealing with a blown fuse, a bad flasher unit, or a faulty turn signal switch. Locate the fuse using your car owner's manual or vehicle repair manual, or check the 'Checking a Light Bulb Socket for Ground and Power' section above, or the 'Testing the Turn Signal Flasher' further down.

Other circuit problems may also lead to this condition:

  1. Check the bulbs condition.
  2. Make a visual inspection of the bulb sockets - look for corrosion and damage.
  3. Verify that the ground connection is working properly. See the section 'Checking a Light Bulb Socket for Ground and Power.'
  4. Also, check for an open (most likely) or a short.

Make sure your turn signal indicators work as well.
Make sure your turn signal indicators work as well. | Source

VI. Turn Signals Don't Flash

If the emergency lights and turn signal lights illuminate but don't flash, check first for a burned-out bulb. This is the most common cause. If not, you may be dealing with a bad flasher unit or a bad turn signal switch. See the sections 'Testing the Turn Signal Flasher' and 'Checking the Turn Signal Switch.'

If necessary, make the following circuit checks:

Check for a blown circuit fuse.

  1. Verify that circuit connections are not loose, corroded or unplugged.
  2. Inspect the wiring harness or terminals for the rear section of the circuit.
  3. Check for a bad connection between the turn signal switch and the flasher or between the flasher and the ignition switch.
  4. Check the power side connection to the turn signal switch for a bad contact or open.
  5. Finally, check for an open or short in the lamp's circuit.

Identify the wires in your turn signal switch using your repair manual.
Identify the wires in your turn signal switch using your repair manual. | Source

VII. Turn Indicators on Dash Don't Flash

You may know there's something wrong with your turn signal lights because the indicator lights on the instrument panel illuminate but don't flash as usual.

  1. First, check that your turn lights work properly. If they come on but don't flash, most likely the flasher unit is bad.
  2. If one of the signal lights doesn't come on, check the bulb; check the bulb socket for corrosion or damage; check for a bad ground at the socket. See the 'Checking a Light Bulb Socket for Ground and Power.'
  3. Check for an open in the circuit, between the light(s) that doesn't work and the turn signal switch.

Use your vehicle turn signals schematic when troubleshooting your turn signal lights.
Use your vehicle turn signals schematic when troubleshooting your turn signal lights. | Source

VIII. Turn Indicators Don't Work But Turn Signals Do

Another problem you may encounter is that your indicator lights don't work at all, but the outside turn lights work fine. Possible causes:

  • blown out indicator bulbs
  • corroded bulb sockets
  • a bad ground
  • a problem with the flasher unit

If necessary, consult your vehicle repair manual to gain access to the bulbs on the instrument panel and ground connection.

Although some models use a separate light for the left and right turn indicators, other models use a single light for both turns.

  • If your instrument panel has only one indicator light for both left and right, check the flasher unit. Some vehicle models combine the brake light, taillight and turn signal into one light bulb.
  • If you have replaced one of the lamps, make sure the bulb is installed properly.
  • If the two separate instrument panel indicator lights don't work but the outside turn signal lamps work, check the indicator light bulbs and flasher unit.

Check turn signal switch connections.
Check turn signal switch connections. | Source

IX. Checking the Turn Signal Switch

Troubleshooting the turn signal switch is pretty much straightforward. Usually, depending on your particular model, getting access to the switch electrical connector is the hardest part.

For this test, it is a good idea to consult the vehicle repair manual for your particular model. You need to identify wires and the best way to access the signal switch electrical connector. Also, if your model has airbags, you may need to disable the system to prevent the bags from accidentally inflating. If necessary, your manual will walk you through the process for your particular model.

  1. Find the wiring diagram for the turn signals in your vehicle model using the repair manual.
  2. Identify the wires carrying power from the flasher unit to the switch and the wires carrying power from the switch to the turn signal lights. Check the color designation for these wires and, if necessary, the terminal number on the electrical connector of the turn signal switch.
  3. Gain access to the turn signal switch electrical connector. You may need to remove an under-dash panel or column cover to see the electrical connector.
  4. Look for the wires that you identified in step 2.
  5. Turn the ignition key to the On position, but do not start the engine.
  6. On the switch connector, find the wire that supplies power to the turn signal switch.
  7. Connect your test light to a good ground under the dashboard - a metal bracket or bolt will offer a good ground.
  8. Operate the switch to turn the left turn signal light.
  9. Back probe the wire that supplies power to the switch; the test light should flash. If the test light doesn't flash, there is a problem with the flasher unit or an open or short between the switch and the battery power source.
  10. Back probe the wire at the connector that supplies power to the left turn signal lights; the test light should flash. If the test light doesn't flash, the switch is bad. Replace the switch.
  11. Back probe the wire that supplies power to the right turn signal lights; the test light should not light. If the test light illuminates, replace the switch.
  12. Repeat the test, but this time operate the switch so the right turn signals light. The only difference in your results this time is that your test light should flash when back probing the terminal that supplies power to the right turn signal lights, but not the left turn signal lights. Otherwise, you need to replace the switch.

The turn signal flasher may be lcoated under the dashboard or inside the engine compartment.
The turn signal flasher may be lcoated under the dashboard or inside the engine compartment. | Source

X. Testing the Turn Signal Flasher

NOTE: This guide deals with analog type flashers. If your system is equipped with a solid state unit, consult your vehicle repair manual for special instructions. Also, make sure to use a digital multimeter with at least 10 Mega-ohm of impedance to protect sensitive circuits in your vehicle as you troubleshoot electrical systems.

A good way to test the flasher unit is to use a known good unit, but that may not be practical. So the next best choice is to test the suspected flasher while installed in the vehicle. Your circuit connections may differ from the outline described here, but you'll find the next general steps helpful. If necessary, consult your repair manual.

  1. First, locate the flasher; you may find the unit under the dashboard near the steering column, or near the battery in a junction box or 'power center.' Consult your vehicle repair manual, if necessary.
  2. Locate the wiring diagram for the turn lamps in your vehicle repair manual.
  3. Identify the colors of the wires that connect to the flasher unit. Identify the wire that supplies power to the flasher, and the wire going from the flasher to the turn signal switch to operate the turn signal lamps.
  4. Connect your test light to ground.
  5. Turn the ignition switch to the On position but do not start the engine.
  6. Operate the turn signal switch in either direction (left or right).
  7. Back probe the power wire that connects to the flasher unit. The test light should illuminate. Otherwise, you have a blown fuse, or there's an open between the flasher unit and its power source (fuse box or battery).
  8. Without operating the turn signal switch, back probe the wire going from the flasher unit to the turn signal switch. The test light shouldn't flash. Otherwise, the flasher is no good.
  9. Now, operate the turn signal switch and back probe the wire going from the flasher unit to the turn signal switch. The test light should flash. Otherwise, the flasher is no good.

The next video shows you a common procedure when replacing a flasher unit on a GMC truck. Depending on your particular vehicle make and model, you may or not need to remove the dashboard trim. On some models, the flasher is readily accessible. Consult your vehicle repair manual.

XI. Turn Lights Don't Turn Off

This is a special turn signal failure. It has to do with the mechanical operation of the signal switch rather than an electrical system failure. For example, you signal traffic your intention to turn left or right, but after cornering, the turn signal continues to flash.

There are two reasons for this type of failure: Either the canceling finger inside the switch is broken, in which case you need to replace the switch; or the canceling cam/clockspring is broken, in which case you need to replace the cam or assembly, depending on your particular model.

In most cases, the repair is within the reach of the average car owner. Still, consult the repair manual for your particular vehicle make and model. Specially if your model has airbags. You'll need to disable the system for safety reasons. Also, your repair manual will tell you what specific tools you need, if any, and the procedure to follow.

Turn signals, and the system they are part of, can fail in many ways. When facing a problem, always check every light so that you know what part of the system or lights are failing. This will make troubleshooting, and fixing the problem, easier and faster. This guide is designed to help you make your repair faster, and get back on the road safer.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

  • My turn signal stays on, but doesn’t flash. It’s the driver side. When I turn off the car, it’s still on. It only turns off when I take out a fuse. How do I fix it?

    The problem could be with the flasher (relay). Try removing the relay and plugging it back in and see if the problem goes away. Or replace it. Another possibility is an issue with the switch itself.

  • Why would my hazard switch come on and not flash?

    The most common fault is a bad flasher relay. But a short in the circuit can also cause the lights to stay on.

  • My left turn signal works intermittently. And sometimes when I brake, the turn indicator light comes on in the dash and the left mirror. What can cause this?

    Probably the brake light circuit has a short and is causing the turn signal to come on. See if you can check the electric diagram (vehicle repair manual) for your model and use a test light to check the circuit.

  • Both my indicators keep flashing and I can't turn them off. What could be the problem?

    There could be a short circuit. A power wire in the turn signal circuit is probably in path with the hazard light circuit. You'll need to test the circuit. A test light or voltmeter and, probably the wiring diagram for your model can help you here. Hope this helps.

  • I have replaced the signal switch, the relay and a front turn signal bulb. My turn signals will come on for a second and then go off. What else could it be?

    Check the circuit for a loose wire or ground and connectors.

Comments

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    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 weeks ago

      It seems like the problem is with the turn signal switch. Once the lever returns to center position, the flasher should be off at this point. The internal mechanism is triggering the wrong contact points.

    • profile image

      Mark 

      8 weeks ago

      Hi Dan, I have a 2006 Chevy Colorado. Both the front and back left side turn signals blink normal on the outside of the truck and the left arrow on the inside dash instrument cluster blinks normal when putting the switch in the left position. When the turn signal switch is in the neutral position both the rear left outside turn signal bulb and the dash instrument cluster arrow stays lit solid (not blinking) and drains the battery. If I put the switch selector in the right position the outside front bulb blinks normal and the rear right does not blink at all and the left arrow on the inside dash instrument cluster stays lit solidly(the right arrow never comes on), When turning on the flasher it is the same meaning both the outside front and rear left bulbs and the right front blink normal and the rear right doesn't work and the inside dash left arrow stays lit solidly. The ground seems to be good in the rear right bulb because the same bulb is used for the tail light and works. I switched the bulb with the left side and it works on that side so it is not the filament. The dark green turn signal power supply wire doesn't seem to have power coming into the connector when I checked with a test light. Do you have any idea what would cause this because I can't follow the wire diagrams too well? Does the 2006 chevy colorado have a flasher? Looks like the switch notifies a bcm. Thank you

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      2 months ago

      Most likely the turn signal switch has mechanical damage. Probably the lock ring is broken. You'll need to replace the unit.

    • profile image

      William A Randolph Jr 

      2 months ago

      have a 1994 Oldsmobile Cutlass Supreme S 3.1 and my signal level is sn't moving.I've had the same issue back in 2014 and they had to replace the whole unit.I do have flashers.When I turn the wheel it clicks as if it was turning itself off,but that's it/Will I have to replace this again?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      2 months ago

      The problem seems to be in the turn signal switch. Check the output voltages there. Probably, you'll need to replace it.

    • profile image

      ksteinba 

      2 months ago

      A week ago I bought a restored 65 Pontiac GTO. Today I discovered that the rear turn signals and brake lights do not owrk. The front signals are fine. I replaced the bulbs, even though they looked good, as well as the sockets. With the bulbs removed, turn signal lever in left turn position and the test light grounded to chassis the left socket flashes and the right socket has steady illumination. When the lever is in right turn position the test light flashes in the right socket and glows in the left. With key on and turn signal lever in the middle the right rear light is on. There is also a scenario, though I forget exactly when, that the right signal flashes with the lever in the left turn position and vice versa. Since there are no brake lights at all my friend checked for power at the brake light switch. When he accidentally bumped the ignition key the test like flashed. I'm baffled.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      2 months ago

      Probably the spring inside the multi-function switch is broken and not cancelling the signal after completing the turn. You may need to replace the switch.

    • profile image

      RENAE 

      2 months ago

      What would cause your blinkers not to shut off

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      It seems the switch in the indicator stalk is faulty, probably the internal spring is turning the wrong contact for the indicator. Also, this could be a loose wire problem making the wrong contact in the switch. This can be checked with a test light. You'll need access to the switch, and perhaps the diagram for your particular vehicle make and model so you can trace the wires. You can find the manual at most auto parts stores. Hope this helps.

    • profile image

      Leisa 

      3 months ago

      Light for indicator on dash is flashing right when I have moved the stalk into the left position (die. to turn left) External light is flashing left as it should be. Why is right arrow on my dashboard flashing when it should be the left one flashing.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      Check the light bulbs, if they are okay, probably the flasher relay or switch are the problem.

    • profile image

      Carmena 

      3 months ago

      My turn light aren't flashing on dashboard and aren't on all 4 sides of car on a 1988 dodge caravan. What would it most likely be?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      Check for a problem in a light control module, or headlight (switch) connector or circuit. A relay may be stuck or a problem with a wire in the circuit. You may need a test light and your wiring diagram to trace the fault. Hope this helps.

    • profile image

      Gio Z 

      3 months ago

      I have a 2006 Ford Mustang and when I start the car the hi beams and left turn signal are on and won’t turn off. What is causing this?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      You need to replace the turn signal switch assembly. You may do it yourself, if you have the service manual for your particular model. Get one online or at your local auto parts store.

    • profile image

      larry 

      3 months ago

      i have to hold left turn signal the right one will not turn off as i center steering wheel

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      4 months ago

      Something is worn with one of the bulbs or possible ground or power is not getting properly to the socket. Check how much voltage you are getting or dropping. Probably this other post may help:

      https://axleaddict.com/auto-repair/Automotive-Volt...

    • profile image

      Wgeep 

      4 months ago

      I have an 08 JK, my hazards work fine. However, only my front passenger side turn signal does not work (everything else works as it should). It does have rapid flash when on though. I have used a multimeter and I am getting current on all these wires. How do I fix this?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      5 months ago

      Check the fuses. There could be a short that affected the circuits.

    • profile image

      Kim 

      5 months ago

      Hi, My 2000 Ford Taurus signal lights (front, rear, and indicators), hazard lights, rear brake lights are not working. Please, may you point me in the right direction? Thanks.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      5 months ago

      These are two separate circuits. Check to see if you have voltage to and from the multifunction switch. You may need a wiring diagram to trace the voltage if necessary. Specially check the connector.

    • profile image

      Michael StGermain 

      5 months ago

      My blinkers only work if my hazard button is pushed down on a 2004 Ford Expedition why is that

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      5 months ago

      Check the relay first. Then check the switch, if necessary.

    • profile image

      Glenn macdonald 

      5 months ago

      i have a 2001 ford expedition blikers quit fuse is not blown what do i do.could using the tilt stering cause this problem also

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      There could be a bad ground in the circuit crossing the path of the other light. Other possibility is corrosion in the connector(s) or a bad connection in the circuit.

    • profile image

      Eric 

      6 months ago

      When turn on either turn signal the other one has a dim flash in it also. This is on my small tote trailer I pull behind my motorcycle

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      This could be a little hard to diagnose, but you may be dealing with a loose/corroded wire in the circuit. This puts too much resistance in a circuit, which heats up and stops working. The problem can be in the turn signal circuit or switch. Have the circuit checked. This other post may help:

      https://axleaddict.com/auto-repair/Bad-Engine-Grou...

    • profile image

      Banda 

      6 months ago

      2014 Nissan versa

      My rear turn signals work for like the first 10 min and after that they don't work anymore and when I use my turn signal it is causing my car to jurk

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      It seems an open or short is activating the turn signal circuit. Look up the wiring diagram for your particular model. You'll need a test light or voltmeter to trace the fault. These other posts may help:

      https://axleaddict.com/auto-repair/How-to-find-a-C...

      https://axleaddict.com/auto-repair/How-to-Find-a-C...

    • profile image

      Tory 

      6 months ago

      My hazards won't turn off. It kills my battery if i don't unplug it. The turn signal fuses are apart of the hazards so i couldnt just pull that fuse out. I changed them to see if that was the problem but wasn't. What could that be?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      There could be a bad ground. This other post may help:

      https://axleaddict.com/auto-repair/Bad-Engine-Grou...

    • profile image

      Reggie 

      6 months ago

      My turn signal, horn, windows, and radio dont work what could be the problem.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      7 months ago

      There could be a bad ground in the circuit keeping the indicators working when they’re not supposed to. If you recently replaced one of the bulbs, make sure you are using the right one for your application. Swap bulbs to see if there’s any difference. You may need a test light and the wiring diagram for your model to check the circuit.

    • profile image

      Glennis Barnes 

      7 months ago

      My turn signals seem to work but the clicking indicating blinkers engagement doesn't stop when turn signal is disengaged.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      7 months ago

      Make sure you are using the correct bulbs for your application. Also, check those bulbs that you replaced and the ones that were there for the turn signals. Probably one of the filaments is broken and stuck across the other filament. Also, there could be a bad ground for the turn signals. Hope this helps.

    • profile image

      Jim 

      7 months ago

      I have a 2005 Chevy 2500hd. My tail lights and headlights were just replaced. All new bulbs. My turn signals work fine without day time lights on or auto lights turn on. When lights come on my left turn signal stays on and left signal blinks fast.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      7 months ago

      It's possibly a bad relay, but there could be a loose connetion, or ground. If only one of the right lights isn't working check the socket and connections; if both lights on the right side, there could be a problem in the circuit. You can use a test light to check for a loose or disconnected wire.

    • profile image

      RonaldThompson 

      7 months ago

      I have a 2007 Isuzu Ascender. Left turn signal works great but when i use the right signal, it works occasionally and other times it stops after a few seconds when i turn it on. Sometimes i have to reapply the right turn signal to finish my turn. Im thinking switch or TS relay

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 months ago

      Usually the problem is with the flasher relay.

    • profile image

      stillwater 

      8 months ago

      2006 lincoln zephyr front signal light won't blink and stays on even when key is shut off ?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 months ago

      Check the ground and power for the rear lights. You can do this with a test light. There could be a problem with the socket.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 months ago

      Sometimes a bad chassis ground can keep the lights from working properly. Check the wire that connects from the battery to chassis. You may want to do a voltage drop to make sure grounds are okay:

      https://axleaddict.com/auto-repair/Automotive-Volt...

    • profile image

      Neil 

      8 months ago

      My 2006 Impala LTZ right rear turn signal / Brake light is intermittent.

      I've pulled the assembly out to check the bulbs. They all worked. Put the light assembly back on and lights won't work. Didn't touch the car for two days. Went out to start car and the lights worked! What's going on?

    • profile image

      Jim 

      8 months ago

      Hello! Here I go! My 2009 Silverado turn signal, brake and reverse lights don't work on the rear right side only. The right arrow on the dash blinks fast. The front turn signal blinks at the same speed (fast) as the arrow on the dash. I've changed all the bulbs and checked every fuse except the big ones. What's up?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 months ago

      Use a test light to check the power wire and ground at the light socket. There could be a bad power or ground connection.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 months ago

      Usually the problem is with the circuit connections either at the light itself or the switch. If only one light or one side is flashing quickly, check that part of the circuit. You may need the diagram for your model, if you need to trace the wries in the circuit. If necessary, do a voltage drop in that part of the circuit:

      https://axleaddict.com/auto-repair/Automotive-Volt...

      Hope this helps.

    • profile image

      Anthony A Gortmaker 

      8 months ago

      I have a 94 Gmc Sierra, My left turn signal is flashing quickly when the running lights or headlights are on, but flash normally when the head lights or running lights are off. I replaced the whole tail light recently due to the previous owner using zip ties and spot welding to hold it together but the problem persist.

      This only started recently after I did a tune up and replaced the distributor cap and rotor, as well as my spark plugs and cables.

      Any help would be appreciated.

    • profile image

      terrymcc 

      8 months ago

      left rear indicator light not working despite bulb changed.

      when left turn selected, green left arrow indicator flashes very fast which, according to manual, could be a defective bulb.

      hazard warning lights work on 3 sides but not left rear.

      all other lights working fine.

      have tested replacement bulb by switching it with right hand rear indicator bulb, and it works but right rear bulb will not work on left.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      9 months ago

      There could be a problem in the wiring; check for a short. If the body control module connects to it, unplug the wire and reconnect. See if that helps.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      12 months ago

      Check section VIII on the post. That's give you an idea what to troubleshoot in the system.

    • profile image

      Chris 

      12 months ago

      I have a Mercedes benz.when I turn on my lights the indicators doesn't work

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      13 months ago

      Check the bulb filaments and make sure they are not shorted together, then check a loose wire perhaps making a wrong connection in that side of the circuit. Hope this helps.

    • profile image

      Joe 

      13 months ago

      Hi Dan.

      Thanks for your article. It was real informative.

      My problem is that with parking lights on my RH turn signals are stuck lit, but a little bit dimmer than normal with no dash indication. When I use the indicator they seem to blink a little bit brighter. The dash light works normally to both sides using indicator and hazards

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      13 months ago

      Check section V of this post. That's give you some help.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      13 months ago

      Check the fuses first.

    • profile image

      Lorenzo Allen 

      13 months ago

      My head lights and brake lights are on hazard lights work. But turning signals want work

    • profile image

      Rach 

      13 months ago

      Hi, my hazard lights work but turn signal and blinkers are not going either.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Check the flasher unit.

    • profile image

      Jim Berry 

      14 months ago

      Turn signals show up as working but can’t hear the flashing.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Hi John

      You need to check the switch and the wiring for that part of the circuit - you need the diagram for the vehicle to follow the voltage.

      Hope this helps

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Hi Jim,

      Check the wiring behind the socket, something is causing the voltage to drop perhaps, which is causing the rapid blinking of the front light.

      Hope this helps

    • profile image

      Jim 

      14 months ago

      99 Jeep Wrangler. All indications of a burned out left rear turn signal bulb (front bulb still works, now at faster rate, dash indicator is also at faster rate, right turn signal system works completely fine). The rear bulb looks ok, but I swapped it out with one I know that works. Didn't solve the issue. Checked the voltage on the contacts that connect to the bulb and it is good (alternates between 4V and 0V when the turn signal is engaged). I'm stumped. Any help would be greatly appreciated!

    • profile image

      John 

      14 months ago

      75 gmc pickup. New flasher, new bulbs. Brake lights, hazard lights and right turn signals work. Left side - only the front turn signal is working. Same bulb for the hazard and they work. I have switched bulbs thinking the filament was broke and it works in the right side rear. Why would ONLY the left rear turn signal not flash.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Probably there's a hazard-lights flasher that needs to be checked or the circuit - and also check the flasher unit for the turn signals, if separate. Another possibility is the turn signal switch or connections.

    • profile image

      Brad 

      14 months ago

      1972 Chevy Nova

      Left turn signal works on outside of car but won’t light up on dashboard. I can hear clicking sound and it blinks on outside. Also my hazard lights won’t work at all. Could this problem be related?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Hi Jackson,

      There could be a problem with the switch itself. You may need the diagram for your model. It'll tell you how to trouble shoot it.

      Good luck

    • profile image

      Jackson H 

      14 months ago

      Hello,

      My car does this strange thing where when I hit the lever to turn left it alternates between the left and right lights twice and then works just fine. At the moment that is not really an issue as it corrects itself in a few seconds, but I wonder what they cause is and if it will get worse.

      Thanks!

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Hi Terrie,

      There seems to be a problem with the switch itself, or the wiring. You'll need the diagrams for your vehicle to trace the voltage.

      Good luck

    • profile image

      Terrie F 

      14 months ago

      My turning signal turning right does not work for the rightside. Instead it turns on the left turning lights when using the right signal. The left signal does not always work for a left turn. What needs to be done to fix this.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      16 months ago

      Hi caseygenedennison

      You may need to check the light bulb inside the instrument panel - either the bulb itself may have failed or corrosion might have set in.

      Hi Misty Norman,

      Check the connections to the lights, make sure the wires are still properly connected and they are properly grounded.

      Good luck

    • profile image

      Misty Norman 

      16 months ago

      My front bumper pulled off my 93 acura legend while backing up for catching on something. now my blinkers and hazards do not work. They worked just fine before. I should also add that my front blinkers are inside the bumper that ripped off. What could it be?

    • profile image

      caseygenedennison 

      16 months ago

      Hi,

      I just purchased a 1993 Isuzu rodeo and my left turn signal is not working as well as the left turn signal indicator on the inside dash. The right side is fine. Any idea what this problem could be and how I can troubleshoot it?

      Thanks,

      Casey

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      19 months ago

      Hi Jim

      The most common issue is with a bad flasher, but sometimes the signal switch will go bad. Also check the circuit fuse or circuit problems like a bad ground or opens.

      Good luck

    • profile image

      Jim 

      19 months ago

      My turning signals on my car don't work on the inside and outside

    • WheelScene profile image

      WheelScene 

      2 years ago from U.S.A.

      This is a very easy to read and comprehensive article. It would be good to note the differences between USA and European turn signals. They can very from model to model depending on where it is sold. Thanks!

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