I have a 2016 travel trailer with a new battery that reads 12.5 volts at the posts. When disconnected from shore power, I have 12v at the switches for my two slides. All other 12v circuits (awning, LED lights, etc.) have 3v or less, so they don't operate. When connected to shore power everything works. All fuses are good and wire lugs in the panel are tight. What would cause this?

Answer

First of all, if you only have 12.5 volts across the battery terminals then the battery is not charged, nor is it being charged by the Converter (charger). You should read around 13.5 VDC across a fully charged battery and as much as 14.5 volts when the charger is running.

The awning slides and interior lights of your travel trailer operate on your coach battery.

So, you need to check that your shore power is connected and that the battery is being charged, and that it has water in it. If these things are OK, then your battery should be charging and things should be functioning.

Make sure that when you are checking these voltages, other than across the battery terminals, that you have a good connection to ground for your meter reading to be right.

Updated on June 7, 2018

Original Article:

Troubleshooting and Repairing RV Electrical Problems for the Beginner
By Don Bobbitt

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