Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. Check inside the pigtail ends for wires toughing causing a backfeed of power and also look for damages or shorted wiring in the trailer. This is likely the cause if it is only doing it with the trailer plugged in. Let me know
sorry I meant touching
Check the wiring on the trailer side and your grounds and too the lights possibly causing a backfeed. Is there another trailer you can hook onto to check if the problem still exists?
Thanks for the update Jake. that tells us it is in the tractor wiring. Check for any shorted wiring in the tractor plug and harness and check your grounds. Clean and tighten all grounds. Also look for any rubbed through wiring creating a short to ground as well.