Wiring
The power cord from the trailer to the card was dragging the ground and the coating was warn off exposing the exposed wire. I taped it with electrical tape but now the running lights work but not the ...
Forum Discussion
The fuses that feed the trailer wiring are usually under the hood of the truck. Look up your truck model and trailer wiring first, but also be sure that none of the wires are touching each other in the worn off piece.
