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The 12 Volt Accessories On My RV Don't Work When We Are Plugged Into Electric.
by Colby
(Greenville TX)
Troubleshooting no 12 Volt Power in RV When it's plugged in
I have a 1983 Layton Travel Trailer. It won't run any of the interior lights when plugged into AC power; it will run the plugs fridge and air. The lights only work on battery power. What is wrong?
ANSWER: Hi Colby, based on your description it sounds like there are problems with your RV Power Converter
The problem could be that 120 Volt power is not getting to the Converter or that there is an internal problem with the Converter or that the 12 volt power from your Converter is not reaching the 12 Volt DC Circuits of your Travel Trailer.
The Converter is in the electrical compartment of your Travel Trailer along with most of your travel trailer's 12 volt fuses and 120 volt circuit breakers. Once you get to the electrical compartment of your RV follow the steps below.
1. With the RV plugged into 120 volt electricity go to the electrical compartment and listen for a humming sound. If you hear a humming sound we know that the Converter is receiving 120 volt power when your travel trailer is plugged in. Important Note: In newer RVs you may not hear a humming sound from the converter.
Regardless if you hear the humming sound or not, move on to step two.
2. Unplug your Travel Trailer from 120 Volt electric and go back to the electrical compartment and visually inspect the wiring. You are looking for any loose connections, corroded connections and any wiring that appears burnt or frayed. If you find any burnt or frayed wiring you will need to take your Travel Trailer in and have it repaired by a Certified RV Technician.
If you find some loose connections tighten them or reconnect them. If you find any corroded connections you need
3. With the travel trailer unplugged check for any blown fuses and tripped circuit breakers. Replace the bad fuses and reset the circuit breakers as needed. Plug in the travel trailer and see if this has resolved the issue.
If none of the above resolves the problem or if a fuse blows again or a circuit breaker trips again; you need to take your travel trailer in and have a Certified RV Technician diagnose and repair the problems.
IMPORTANT NOTE Do not attempt to open up the converter and repair it. There are no user repairable parts in there. If you start fiddling with the inside of the converter you can cause further damage to the electrical system of your RV or create the potential of an electrical fire in your RV.
The troubleshooting steps I outlined above are very basic, but they should be able to uncover the most common causes of the problem you are experiencing. There are more comprehensive steps you can take to find some more uncommon causes of your problem, but I do not have the space here to detail each and every step.
If you are the type of RVer that would like to be able to better diagnose electrical problems in your RV then you might want to get a copy of RV Electrical Systems: A Basic Guide to Troubleshooting, Repairing and Improvement
by Bill and Jan Moeller or RV Repair and Maintenance Manual: Updated and Expanded
by Bob Livingston. Both of these highly rated books have some great troubleshooting tips on diagnosing problems with your RV's electrical system. These tips will save you both money and time.I hope that this information has been helpful to you.
Do you have any suggestions or comments on this topic? You can add them to this page by clicking on the "Click Here To Post Comments" link located near the bottom of this page.
Happy RVing
RVing Al
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