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How to Diagnose an Alternator or Electrical Problem

Updated on November 9, 2016

Diagnosing alternator problems can be a bit tricky because the electrical system in a car comes from two places, the battery and the alternator. I'll give you a little background so you can understand what both systems do.

  • The battery has one primary function, which is to start the car. It provides the high amount of voltage needed to turn the engine over. After the engine is running, the alternator takes over.
  • The alternator is basically a generator that provides an even amount of low-level electricity, which it generates with a circular bundle of copper wires and a rotating magnet.

After the engine starts (thanks to the high voltage provided by the battery), the alternator provides the electricity required to power the car's many electrical functions, including the lights and radio, the spark, charging the battery, and others.

What Happens When Your Car Has an Electrical Problem

When your car has an electrical problem you will notice any of the following:

  • Car power slowly dies while you're driving.
  • Lights begin to dim.
  • Trouble starting car.
  • Car won't start at all.

What to Check to Diagnose Your Car's Electrical Problem

Alternator
Battery
Spark Plug or Ignition Coil
Solenoid or Starter
If the problem is a bad alternator, your car will slowly lose power. You'll be driving down the road, your lights will dim, and you'll lose power and die.
If the problem is with your battery, then you'll generally only have trouble starting your car since that's the battery's main function. Your lights may also be very dim.
When an ignition coil goes bad, the result is similar to a failed alternator: The car loses power and won't start.
If your car's solenoid or starter are bad, the lights will shine brightly but the engine will not start.
Once the alternator stops working, so do all of the electrical systems required to keep a car going.
Other problems can also cause a car to not start. It could be a bad starter, corroded cables, or a broken connection somewhere between the battery and starter.
When a coil goes bad there may be smoke or odor. Open the hood immediately and check.
A failed solenoid can make a clicking sound when you try to start the engine.

What Causes a Faulty Coil or Spark Plug?

Spark plug or coil problems can also make your car lose power and die. The ignition coil turns the battery's low voltage to the thousands of volts needed to create an electric spark in the spark plugs, which ignite the fuel. Coils can fail due to heat or vibration, or when there is a bad connection to the spark plugs.

As described above, when the coil goes bad, parts of it often melt and there's sometimes smoke or an odor. This will only really help you if you open up the hood immediately after it happens and check. If you check hours or days after the fact, then you won't be able to smell anything anymore.

Dual ignition coils (the blue cylinders at the top of the picture) on a Saab 92.
Dual ignition coils (the blue cylinders at the top of the picture) on a Saab 92. | Source

Test Your Systems Before Going to the Auto Parts Store

Before you go out and order a new battery or alternator, test some of these different systems. If your alternator, coil, battery, or starter is bad, the car probably won't start, and it definitely won't be drivable.

Try to get as much information as possible so that you can get the right parts quickly when you go to the auto store.

Depending on which system is bad, you should be able to fix it yourself.

Alternator Prices and Installation

Make sure that your current alternator is beyond repair first before getting a new one.

Alternator prices can vary greatly by make and model, but generally speaking, new alternators should run around $250 without labor for installation.

If you're going to order and install the part for yourself, then it shouldn't be too expensive — just a few hundred bucks. If you need to have it installed by the mechanic, then the price might be a bit higher.

Depending on where your alternator is located within the compartment, the installation might only take an hour. But if the alternator is difficult to access, it might require removal of other parts and it could take many hours.

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    • profile image

      Julio 2 days ago

      I tested my new alternator before I put it in my car ( tested good ) When I installed it wouldn`t charge. This is the third alternator

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      Jennifer 4 days ago

      Volt start dropping on the gauge in the car and the engine will shit down but you can crank it back up

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      Nora 2 weeks ago

      Why donot cars have to be so hard to fix, I'm a single mom, I don't have a lot of money, can't afford a guy to fix it ,or to put out $200+ for a altenator, now I'm screwed.

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      Leonardo perez 4 weeks ago

      I have a 1997 ford explorer xlt, has a brand new battery and new alternator but the battery light is still on, when I leave the battery connected it drains the battery and can't start it again unless I jump start it, but when I disconnect the battery and connect it back the next morning the truck starts up fine and runs but the battery light is still on and is shows it is low, what might be the problem?

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      Tammy- 2003 Chevy Trailblazer LS 149000 miles 4 weeks ago

      So I got a new battery last week, last night while running errands, I notice the gauge on my battery going down. By the way since getting new battery, battery light still on, gauge shows 12 until I drive for a minute, light goes out, gauge moves up to 15. Decide I better get it home, so I am not stranded. As I am driving, my battery gauge goes all the way left (dead), the rest of the panel all goes to the left, including speedometer. my headlights are so dim, I can barely see. I get it home, put it in park, wait for it to die, the dang truck is still running, even with everything dead, so therefore, I am not thinking its my alternator, as even though everything is dead, my truck is still running. I try to get my window up, nothing, turn off the truck. Now, I am completely dead. So my question is, is it the alternator?

    • profile image

      Brandon 5 weeks ago

      My. Battery saver mode came on alternator smoked and went out completely and I have no power at all am I supposed to have at least somepower to see dash or roll up window or when the altanator goes out am I supposed to have no power

    • profile image

      Kenny 6 weeks ago

      I have a 2002 chevy trailblazer im having problems with my vehicle cranking .i put a new starter a new battery an alternator why is my battery still going dead when trying to start

    • profile image

      Ian 7 weeks ago

      Hello just wondering if you can help me .my Vauxhall combo van 2004 spanner like comes on. when driving engine lacks of power then engine has rattle nose

    • profile image

      Tom 7 weeks ago

      @004 GMC Sierra 1500. Dash cluster comes on and goes off sometimes including the gauges. Truck will still run. Whats the problem?

    • profile image

      Jesse lang 8 weeks ago

      When car is running brake lights head lights and horn will not work when car is not running they work what is problem

    • profile image

      CC 2 months ago

      Hi, I have a 2003 Honda civic, all the dials and the stereo quit working and the car was not going into gear and finally, the engine quit. I have put in a new battery and a new alternator and am still having the same issue. Wondering if you have any suggestions?

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      #CONFUSION 2 months ago

      Have a 2008 Chrysler 300c ..Battery keeps dying on me first it was every other month then every other week then every other day and now it's every other time I turn off i have to jump start it every time..I'm just not sure when it will do it :/ one day I drove it and it left me stranded,called mechanic they had to pull me to the shop..there they said it was the alternator so the fixed,car was running fine but then car continues to do so after 4 days of them fixing the "problem"according to mec it is all in tip top ,battery starter alternator read that they are in good condition. .they took radio out messed with wires here and there and no solution what so ever ..Not even my mechanic can find the problem. .it's to the point to where they don't even want to touch the car anymore cause it won't let them know what's wrong ..#HELP

    • profile image

      Madmaxwell 2 months ago

      I changed my clutch h by my self in. My ford explore sport an it wS turning over then all the sudden it wont.... I have a brand new alternator an battery all wires are connected but it will not start an lights inside stop could some one help me out thanks mandated

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      Nickie 2 months ago

      I have a 2013 dodge avenger and I have replaced the battery ,starter,and the alternator and the only way my car will start is with a jump and the battery light stays on, once you remove the jumper cables the car dies out. For some reason the battery voltage keeps droping. Please I'm in search of answers

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      Phil 3 months ago

      Had my oil on a 2013 Jeep compass changed - car would not start after service and the vehicle was jumped. While driving home car had little power, brake lights and check engine light came on. Does this problem indicate an alternator issue. Vehicle will not start

    • profile image

      Bobbi mcneely 3 months ago

      The other day when I was at work when I went on one of my breaks I started my car had the heat on cause it was cold. A few hours later when I went to leave for work tried starting it and it turned over and started but instantly died. 3 hours later it started right up and it's started up fine ever since. What will cause this ? I have a 2006 mazda 6s

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      michael panal 3 months ago

      Thànks, you help me about the lighting trouble of my van.this is very helpfull to me

    • profile image

      debbie 3 months ago

      i have a vw lt horse lorry I have just put new battery in the battery light come on when there n keys in it there nothing turn on why

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      julien masseing 3 months ago

      thank you very helpful

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      Adma 3 months ago

      My 2004 Volvo s60 was making noise with the breaks so we took it to mechanic. He says the alternator is dead. This is possible as there are some warning signs such as dim lights, but the car is refurbished and the electrical was always bad. I find is suspicious that the alternator is bad when I can drive it from Indiana to FL without it dying, and then I drove it 45 minutes to and from work 5 days a week (sometimes 6) with no problems. What would you suggest? Thanks!

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      Sandy walker 3 months ago

      About a week ago my car started running hot I replace the thermostat in it but also when it was running hot and my battery and my brake light had came on I replace my battery in my alternator about two years ago after I replace it though my car had broke down with transmission problems and it had sit for about a year after that when I go out in the morning to start it I have to jump it off but after that it runs but my car is still running hot I had to turn the air conditioner on when I turn the air conditioner on and the fans kick on my battery light and my brake light goes off any suggestions if my alternator or my battery has gone bad I mean it's just been two years since I replaced it or could I be dealing with something bigger

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      Keke 3 months ago

      Okay so what is the problem if u turn your car off and get out and your lights still on what can it be I have a 95 dodge intrepid

    • profile image

      Fred 3 months ago

      Sounds like a poor connection point in the ign switch

    • profile image

      Jane Waruiru 3 months ago

      I had my Toyota Corolla 2010 alternator changed today. After picking my car from mechanic, I noticed that the AC and radio are not working . What could be the problem

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      Wesley Temple 3 months ago

      My 2000 Ford ranger will not shift the dome light will not come on the windshield wipers don't work the windows will not go down unless the door buzzer sounds off when you crank it up where could the problem be and how can I fix the problem myself

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      Terri livingston 4 months ago

      I put a new battery in my car. On the negative cable there is an additional red wire connected. So the battery side is hooked up but where do I put the other end of that single wire?

    • profile image

      BRUCE JEWETT 4 months ago

      94 HONDA ACCORD NEW ALTANATOR WON'T PUT OUT TO IGNITION

    • profile image

      ingrid 4 months ago

      after installing the alternator in my 2004 Volvo c70 , i now have an electrical problem. one of the fuzes keeps blowing. I am not sure my mechanic disconected the battery when he changed the alternator.

    • profile image

      pam 4 months ago

      my car has a new battery but it will stall and sometimes not start unless its jumped

      2000 Buick century

      so we got a starter from a junk yard but did not work so replaced the original one cleaned it and everything. its at the mechanic and they are telling me its the throttle body but I don't know if I can trust them.

      the car has stalled on me and I had to put it on neutral and turn it back on and sometimes when I leave it overnight or going home from work it just doesn't start so I have to get it jumped

    • profile image

      Derek hanks 4 months ago

      I have a car with new altinator and battery and it still ain't charging my battery all conetions are tight and belt it tight

    • profile image

      Sharon 4 months ago

      1999f150 ford pickup truck .probablems with my truck starting thought battery dead put in new battery drove it to work 3 days total miles maybe 20 .today started up truck drove about 21 miles wipers start failing finally they stopped light on dash went off every thing on dash stop truck dies ?

    • profile image

      Richard LOckstein 5 months ago

      2007 GMC Sierra 4x4 truck turned off key out of ignition the battery light on the dash will randomly come on along with the dash lights and radio but will also go out on its own when it feels like it. everything works perfect while truck is running. have any suggestions?

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      Miss Frankie 5 months ago

      Thanks for this AMAZING ARTICLE.

      Being a woman and blonde lol, it was easy for me to read and understand.

      Also comforting to hear others having similar problems to me.

      CHEERS GUYS

    • profile image

      Benny 5 months ago

      My battery isn't getting a charge from the alternator. The car does start, and runs Briefly after getting a jump. The battery signal doesn't come on, but all of the other signals appear right before the car cuts off. I checked all the other connections and found nothing wrong. Even swapped the pigtail connection plug. I did have a oil leak, and some of it got inside the alternator. Could that be the reason the car won't stay running??

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      Tresa 5 months ago

      I have a 93 Buick Park Avenue. I replaced the alternator and battery about 6 months ago. I was driving this evening and my battery started to drain. Not sure where to begin with trouble shooting. Any suggestions?? Thank you

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      Juan Garcia 5 months ago

      I have a 2004 Ford Explorer Xlt 6 Cilinder. I change the alternator n new batteries. I check the belt. But the funnie thing's is that the alternator voltage is low (11.36 volt) the alternator is supposed to have a voltage of 14 volt up. I check the cables that goes ground positive I cleaned. But steel the same problems. The alternator volt low. N. I took it back to the shop store autozone n took another one. I installed but still the same problem. If anyone have ideas what is the problem please send a massage yo justingarcia2003@gmail.com. thank you very much for your support.

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      Levi 5 months ago

      So my car starts and runs, however it makes a clicking sound only when the door is open. The windows also don't roll up anymore. It got stuck down now it's rained everyday since haha.. could it be the The solenoid? If so would it cause the windows to stop working as well? Or would that be a fuse? Any advice at all would help.

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      teresa 5 months ago

      I put in a tearing column and it won't turn over or start can u help me a 1998 chev blazer

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      Ryan 5 months ago

      Went outside this morning to start my 98 Jeep Cherokee Laredo it's acting like it's dead battery is fully charged lights on the inside come on when I push him but not when a door opens like normally it's acting like it's getting some power but not enough to do anything really the only thing that really seems to work is the dinging when I put the key in and the light comes on kind of when I push it the interior light any ideas?

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      Rick 5 months ago

      The battery light on the dash runs after starting in 30 secs. Is it the alt. As now it's dead.

    • profile image

      Ruby Redd 6 months ago

      Can you also check for bad alternator by taking both cable post off battery while car is running & car shut down is also a sure sign bad altornator?

    • profile image

      Ashly 6 months ago

      My 1995 Camry windows won't work either does my speed adomotor I just bought a new alternator

    • profile image

      Shelley 7 months ago

      Hi, I am after a bit of advice. I have a Mitsubishi Lancer and when I now start to drive it, the speedo takes about 1 minute to start working then just does its stuff normally. Any ideas?

    • profile image

      Johannes moloi 7 months ago

      My Peugeot 206 I did change alternator after 250 hours the alternator' stop charging again so I don't understand why can someone help me on that

    • profile image

      Jgf 7 months ago

      Thanks a million. Great article.

    • profile image

      Wendy 7 months ago

      If my hazard light cause my car not to start if it has a short in it

    • profile image

      Mike 7 months ago

      Ok need some help. I have an 03 ford expedition. Its been sitting a while. Jumpstart it and turn on lights, it does completely. No nothing on anything even if I try to jump it again. So 6 months go by and I jumpstart it again and it starts up. Step on the brake and it does again. No lights radio or anything. Same as before. Any suggestions?

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      Josephine Charlie 7 months ago

      I'm having a big problem with my 2008 GMC Sierra 1500. First, it would die out by having emergency blinkers on for about 5 minutes, or leaving door open with interior lights on for about 5 minutes. So I had the alternator& battery checked at O'Reilly's. They told me it was the alternator, so I replaced the alternator. A few days later, it started doing the same thing. So I took it back to O'Reilly's, to have them recheck the alternator. They told me it's the battery, so I had the battery replaced. I drove it for about 10 minutes, & it's doing the same thing. So now O'Reilly's is telling me I probably bought a bad alternator. Is there a fuse or electrical system I need to check.

      During this whole issue, the headlights are dimming like it's ready to die out, while running, & driving. Place help me! Thx

    • profile image

      Juan 7 months ago

      My car is a 92 Honda Accord 2.2 it has a new battery and turns on good and drives nice the only problem is that when I am driving down the highway and I change lanes I use my turn signals my gauges go crazy any idea why I would appreciate any help thanks alot

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      Sonny 7 months ago

      Was driving and lost all power and truck stalled. Will not crank or power showing on dash . Change computer, change ignition switch, change relays there 4 of them, no burning smell or burnt wires . What would case all power no come to dash then to starter.

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      Clarence 7 months ago

      QUESTION: I drive a 2003 Chevy Trailblazer. Recently, the battery light is on while driving and the amp gauge drops. When I accelerate, the battery light goes out and the amp gauge return to normal. Now, the battery light stays on and the amp gauge won't climb regardless of high rpm's. Pulling my hair out. Could it be alternator? Battery is good.

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      me 8 months ago

      I know nothing about cars but to drive them. Thanks for the easy to understand information.

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      Laura 8 months ago

      My sons car wont start. His lights wont work. Radio. Nothing at all. There is absolutely no electricity. He has had some problems lately. He put in a new alternator n then things were fine for a while. Then the car stopped working n he had to replace the fuel pump n then it worked fine for a while. Then he had to get a new battery n it worked for a few days. Then it completely stopped working. He took the battery up to auto zone and they charged it to 100% n he got it home n it still wouldnt work. Why? What could be the problem? Thanks

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      Blair Day 8 months ago

      Thank you this article helped me understand what's possible wrong

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      Trina Crawford 8 months ago

      Hi, I have a dodge avenger 2008. I drove my kids to school this morning and I went downtown then I notice that my AND and slipper when wet indicator came on. Then ten minutes ten minutes later notice my radio went out. So I continued to head rob the grocery store everything still fine. At a stop light I shut the car off and turned it on again then the radio came back on. As I started the car and e mind into the drive the car stop and it cranked for a sec and then cut off again . Tried started several time wouldn't catch and shut down again. Finally after putting my feet on the accelarator am the gas pump it moved just enough for me to get it to a parking space on the street. However, tried to start it again it would not start at all. Could this be the alternator?

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      melissa 8 months ago

      I have a 1998 ford expedition 4wheel drive,half ton automatic transmission.THE HEATER QUIT WORKING FIRST,NOW THE AIRBAG LIGHTS ON,ABRAKES LIGHT IS ON ,CHECK ENGINE LIGHT IS ON,SMELLS LIKE ANTIFREEZE BAD.I CAN HERE SIZZILING LIKE UNDER THE STERRING WHEEL,OR MAYBE FUZE BOX.NOW THE 4WHEEL DREIVE DOESNT WORK AT ALL&TRANSMISSION SHIFTS REALLY HARD .IM GOING CRAZY,ONLY HAD VEH,FOR 2 MONTHS,I BOUGHT IT USED& R STEAL MAKING PAYMENTS ON IT.THEY WONT HELP ME FIX IT OR PUT ME IN ANYTHING ELSE,W\O MORE$$ DOWN.PLEASE HELP ME .!!!IM ON DISABILITY & CANT AFFORD TO TAKE IT TO A SHOP..THANKS AND GOD BLESS

    • profile image

      diane 8 months ago

      change the battery in my 2006 kia sportage 4 wheel after that the windows and heat and radio does not work do you think that it is the alterntor

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      Chris 8 months ago

      My cars lights started flickering then quit, shortly after the car died and would not restart , any ideas?

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      Olga Santos 8 months ago

      Thank you for the information! It was very helpful and easy to read and understand!

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      Pieter Hatting 8 months ago

      Hullo im from South Africa i have a 2002 mod Toyota Corrola 1600 GLE feul injection recently the batt run low overnight and thees a smell by the wiper motor and as she starts. And when i rev themotor the wipes start up a ele trical smell is strong could there be a short somewhere and where do i look pls help im desperate its a very reliable car still in mint condition any a ideas??

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      Emily Gonzalez 9 months ago

      As soon as i jump start the car, then i start driving the car. the lights start fading away that i have to keep pushing the gas for it to keep going than i turn it off and now it won’t turn on again. everything from inside the car works, then i noticed its been smelling like something is burning with some smoke coming out up front. My battery is new, the alternator has already been changed. what else could it be?

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      KCVenom 9 months ago

      Okay I just replace the alternator and the battery on my car. But I can now start my car and run it. the problem is that it is shutting down. So what else could it be?

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      dan 9 months ago

      my truck will seem to loose all power (dashboard lights turn off) but truck keeps on going, it doesn't completely shut down.

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      jim 9 months ago

      my car start great i drop my nephew at school then i get coffee at a gas station when i start the car the battery lite come on after driving for about 5 minutes the light goes out

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      Bruce 9 months ago

      Hi

      Have a2000 sienna , battery is new , but easily loose power , I can drive it for along distances , but some times if i open ac , and stop the car at feul station it won't start , even some times when it parked for a couple of days , it won't start until I jump start it ..the car has alarm system , could it be it?

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      Bill Rich 9 months ago

      alternator needle on gage sometimes flickers like I have seen with a generator when the battery is at or near full charge car is a chevy celebrity

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      Rebeccagamble3133@icloud.com 9 months ago

      Finally an article about a car I can understand! Narrowing down my problem thinking battery or starter.

    • profile image

      Tiffany 10 months ago

      2001 eclipse 2.4 new battery new alternator and car still won't keep a charge.. I can drive for a minute then I loss all power .. what can be wrong

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      Jimmie C 10 months ago

      my car died while i had it running i jumped it it started but soon died again later i changed the alternator and the battery and was riding good for about a week and the same thing happend again my battery is dead and when i jumped it it died shortly after i drove i have a aerio suzuki 2003. all my parts and battery have warranty

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      Angie 10 months ago

      The last couple days when going to start my car it clicks and wont start on the first try starts on the second but today I tried to start it up it clicked the first time the second time made a loud noise startedthe third try but it didnt want to start I go to get my headlight fixed because my left one keeps going on and off had to get a socket and car wouldnt start or turn over no lights nothing put a different battery car starts ten minutes down the road all the lights starts flickering car shuts off and locks up on me I couldnt use the break or turn I had to throw it in park when it slowed down and had a bad smell but the dashboard has been shuting off for a while now every now and then and I have to restart the car can anyone ease help me my trac light came on with all the other lights when they flickerd before the car stalled anyone have any ideal ?

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      Mike 11 months ago

      Hey My son was driving his truck. The truck with his lights on going down the road just up and cut off on him. Well I automatically thought it's the alternator. I took his to a parts store and it checked good. I purchased a new one anyhow just cause I didn't know if the regulater in it was going in and out. Well. I put it on and jumped his truck off. Let it run for about an hour. Drove it down the road and all. Seemed ok. The voltage gauge was not moving where it needed to. I thought maybe it's just the gauge not reading. Well this morning it won't start. It's like it's a dead battery. Would it be the battery now before I go buy a new battery or something else ?

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      Michael 11 months ago

      I have an 1999 GMC SOnoma, that is acting funny. It has a new battery and all the bulbs work with no shorts, now start it up and run for a minute. And the lights start flashing or flicking but, not all the way off. The alternator gage is bouncing to the neg. side. I've checked the tightness of the belt and it is fine, the pulley is fine also. What can be wrong?

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      Jcm 11 months ago

      GOD BLESS

      ,,

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      Michael 11 months ago

      I have a car that isn't my primary vehicle anymore. I didn't drive it all summer and the battery was dead when I started it up in Aug. I recently put (3 weeks ago) a new battery in. Didn't drive it until 2 weeks later....dead as a doornail. A mechanic said I needed anew battery and since I had it warranteed I put another new one in. Two days later dead again. I took it to the dealership Subaru and they recharged the battery and checked alternator and starter and said they are fine. What to do? I know it is going to die again. What should they check next?

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      Habib 11 months ago

      you should be a teacher, perfectly clear information

    • profile image

      Juan 11 months ago

      Why would my car a 2012 Malibu alternator not charge my battery I just bought a new one .I checked as all fuses got new battery and still no start won't change at all so I had to run the positive wire directly to the battery now it charges but I want it fixed right .do I have to buy a new fuse link wire or something I can't seem to find any information on this help me please

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      martin 12 months ago

      Good morning

      if i stop the car and switch the engine off and leave the lights on by mistake , even for a minute the car will not start unless I jump start it . is this a problem with the battery or the alternator or something else

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      monica 12 months ago

      My car radio shuts of and on battery light went on dash lights and gages stopped working. I was driving and it,kept wanting to turn off on me. Then it turned off didn't want to start anymore. Changed alternator and starter and car battery

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      Marie 12 months ago

      My 2005 saturn vue driver side power window will only go up half way or change to only going up all the way but down half way. So i took off panel n sprayed wd40 as seen in a video. N still not working correctly it sounded like dirt was in there as it moved. I stupidly put water to rinse off so called dirt. N now my car doom light stays on constantly now. N my car want to cut off after started n has cut off different times while on. So i disconnected the battery so it dont uncharge. My car ran fine until i did this stupid thing.please if u have any advice please let me know. N where do i take to get fixed.im not sure to take to a power window repair or a diagnostic repair or a general repair place. Thank you for your help if u can. God bless you. Marie....in distress

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      Bobbi 12 months ago

      So my car just died on me about a month ago. I took it to the shop and they said I needed a new alternator. I got it towed back home because they tried charging me $800 to change it. We decided to do it ourselves so we got a new alternator, changed it and it still wasn't working. My radio, power steering, and heat/air wasn't working either. So we took the new alternator and my battery and got them them tested. I had a bad battery. So I bought a new one, got it put in. Now my car runs, but my radio, heat/air, and power steering still isn't working. Any ideas of what it could be. I'm at a total loss here.

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      Anthony 13 months ago

      I had a bad starter and solenoid so I changed them both but before I did I disconnect the battery. After putting both part on I connected the battery back on but 02 expedition shows no power anywhere. So I checked to see if the battery is good I put a screw driver to the starter solenoid and there's power there but that's it. I checked all fuse and they are good. But I didn't know how to check the black box fuse. What could be the issue and what fuse powers the truck. It's a 02 expedition 5.4 l 2wd. Plz email me at anthony05292013@gmail.com

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      grahamstuart 13 months ago

      2005 Hyundai Tucson question. A day ago my wife drove the car turned it off, and initially would not restart, but she said no clicking. Today the stereo doesn't work, and the air bag light (which should have been on ) pulsed when I used my turn signals. Not sure if I have an alternator issue, or battery issue or other. Any suggestions?

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      surya 13 months ago

      This is the best article on alternator I have spent a lot time researching. I have a 2012 acura which started after giving a jump start with another car, I took the car to autozone and they said I had a bad alternator. After that I tried starting my car twice which started immediately without any lag. But the display shows me my car battery is low, I am confused if the alternator is bad or battery? Any help would be appreciated.

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      Latoyia 13 months ago

      I have a 97 honda accord i replaced the alternator and now it wont stay crunk once i take the cables off the battery

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      noah 13 months ago

      I drove my car for 6 hours straight started fine each time i Turned it on and didn't seem to have any problems, not when i plug in the key to turn it on, everything lights up and get ready to be turned on… then when i twist the key the whole car shuts off and won't start

      what could this be

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      Samantha 14 months ago

      When I jump off my battery as long as I do not cut off my car it will run but once I cut off the car I have to jump it off again what is wrong

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      LS Leon 14 months ago

      Hi, this is a very nice article, thank you. My car's dashboard needles, like the gas gauge needle, take a second to move when I first start the car. Could this be related to the alternator or could it be more of a sensor problem? Thanks in advance.

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      Mrs. Do it herslf 15 months ago

      02 Cadillac Deville. Battery good. Alternator good. Loosing voltages while driving. Just cleaned battery connector that was a tad dirty. Could it be electrical?

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      SAMm 15 months ago

      Hi, I'm having an issue with my 1997 Geo Prizm. I have a new alternator and battery but battery light stays on. Had them both checked again and battery is good but alternator isn't registering, the yester days to start car but car is on. Could it be a loose connection, maybe the alternator bolts or the connection from alternator to nattery, that particular battery terminal? Please help, I have no one to help me, I'm new to this area, far from home. Thanks in advance.

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      Roz 15 months ago

      I brought a new alternator and the car ran fine for two weeks and then started acting up again so I took the battery out and had it charged and when I put it back in the radio doesn't come on and it cuts off like the alternator is not working again and I brought it brand new from auto zone please help

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      adry 15 months ago

      Hello im having a problem..i stil cant resolve. :-( i just bought a brand new alternator yesterday since it went bad. I checked it at O'Reilly my old one. Well i put the new one and after one day stoped working again and car turned off again like my old one. Why did this happen? Could it be that the new one was bad too.???Or an electrical problem???

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      Peter 15 months ago

      I shut my Jeep off with lights still on and it started ticking so I shut lights off ticking stopped but it wouldn't start after that so I jumped it and it started fine and have had no problems during driving no loss of power or dim lights or anything, I think I'm going to buy a new battery but am not sure. Anybody?

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      blaine 16 months ago

      My trucks acting up the battery light comes on and the rpm gauge and gauges start jumping?? Any clue what it can be???

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      Bennie 16 months ago

      So my car does this all the time... sometimes when I start my car every is fine...other times I start my car, the rpms will be higher than usual (1500), and once I turn off my car, I'll try to turn it back on, and it won't start, I have to wait 10-20 mins before I can get my car to start again, any thoughts of what this might be?

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      Claudia 16 months ago

      I have peugeot 5008 that went mot but in midlle car stops and not turn on

      Says communication failure on computer

      ANY ideas?

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      skyler 16 months ago

      ok so i have a SERIOUS question? if i beat my system sometimes just depends but eventually it will just shut down..ok but recently it made my headlights everythang in my car stop working but it stayed running after about 15 minutes everythang was working again but it didnt die. and if i beat it and i park usually the car wont start i have to jump it just for it to start.really frustrating .would love tah hear some opinions on this because i dont know what quite it is.

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      Jenn 17 months ago

      Hi, I have a 2006 Chevy trailblazer and I have noticed that when I have the car in park and just waiting inside my car the light to my dashboard would dim and I notice on the dashboard the lil alternator meter that I was always tld should always stay in the middle and whenever I put the car in park and leave my car on it starts to go down and stuff in my car starts to dim but when I get my car off park and start driving it goes right back up and stays up! What could this be??? I took it to a mechanic and he said that my alternator looks fine ! ??

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      Celia 18 months ago

      Help, my phone charger stops when I turn my head lights on. I have a Toyota corolla Levin 2009. Can anyone help please

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      Katie 18 months ago

      About a month ago, my car radio stopped working, and then a week later, the battery died. I got it jumped, drove it around a bit, and then had the battery checked at a garage. After the jump, the radio started working again. I chocked it up as a fluke, and mostly forgot about it, but now my radio has stopped working again, so I'm worried. Any ideas of what could cause this?

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      rodney 18 months ago

      I have a 2006 mitsubishi eclipse gt iput new batery starter but still just buzzez when i turn on ignition jump stafrts fine runs good shut off does the same thang my hazards wont work or blenkers