2002 Express Trailer Wiring Diagram. Not sure which wires attach to what on your trailer connectors? Not all trailers have reverse lights, so.
Check the wires going to the trailer and make sure none have rubbed through. Use this handy trailer wiring diagram for a quick reference for various electrical connections for trailers. Note: Identify the wires on your vehicle and trailer by function only.
Use this as a reference when working on your boat trailer wiring.
Trailers are required to have at least running lights, turn signals and brake lights.
Diagrams are looking from the outside of the plug or socket. From what I've noticed, the primary wires used are yellow, brown and green. Hardwiring requires the installer to locate the proper.