Not quite an RV question, but--I'm volunteering at a Fl state park. We have decorated a tram to use as a float in a local parade. When checking the turn signal & brake lights on the tram I am having a...
Use a set off jumper cables or pieces of wire to test trailer. Connect cables/wire to good battery insert wires into each pin, with ground connected to trailer, test each function. This will tell whether it is trailer or truck. Could even start by connecting truck to trailer ground with jumper cable. Yes, it sounds like a back feed. You may also remove taillight bulbs one a time to see what changes with the rig hitched to truck.
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