Do you need a ground wire on a trailer?
Do you need a ground wire on a trailer? It needs to ground through the wiring of the trailer harness. You can test this… Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work It could be a tow package fuse on the vehicle. Where does the white wire go in a trailer? The White Wire is the “Ground” or “Negative” wire connecting to the vehicle battery “minus” side. The trailer wiring diagram shows this wire going to all the lights and brakes. Also, it must connect with things (if included) that use the Aux Power...