Ditto same here. Chased my “check trailer wiring” message for two seasons.
Changed 7 pin cable to camper, checked what I thought everything.
Found a tiny barely worn wire where it enters the axle tube.
Ran tape around for now, plan on running new wires on outside of axle tube ASAP
Bowhunter and Linda
2012 Zinger ZT 26BHS
2019 Silverado 2500 HD High Country 4x4 6.6 Duramax Diesel and Allison
1995 Ram 1500 4x4 5.4 Gasser/Hunt Truck (cherry)