That is a weird one. Sounds like power from the trailer is back feeding the light . The system is separate from your Trailer 12 volt battery and should not effect one another. Wiring issue?. The first thing I would try is switching the light side to side if you can and see if there is the same issue with both lights. Silverado
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2015 FunFinder 210uds, 2014 Silverado LTZ-Z71 Regular Cab Short Box, 5.3l with towing package
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