Trailer Lights No Ground Wire. Ensure the ground wire connects to the trailer frame. The lights are connected to the bed, but the tongue is a movable piece which may have grounding For this I will be soldering the wires instead, you can use weatherproof connectors too, your choice.
For the ground wire, I had to extend this.
Turn signal, running ans brake lights.
Trailer wiring consists of a plug connected to the tow vehicle's lighting circuitry, a matching connector on the trailer, a wiring harness The white wire (paradoxically in our opinion) is the ground wire, and even though the trailer hitch acts as a ground, you should connect. The brown wire is for your tail lights. You don't necessarily have to have a wire ground because most light kits ground directly to the trailer.