If you are running on electric or gas, you will still need 12 volts from your batteries for the controls. If your lights in the trailer are not working, your batteries may be dead, because most of not all your lights will be 12 volts. Have you checked any battery disconnect switch you may have that it isn’t off so that the converter isn’t charging the batteries? Also, please list what your rig is so helping diagnosing your problem will be easier.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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