Car wiring diagrams: 2 Wire Trailer Plug Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Left Turn, Yellow, , , Left turn of vehicle s wiring harness, Trailer s left . A converter will reduce it to a standard wire system needed for wiring a trailer..The colors for wiring a way connector are as follows with the colors of the Featured Help Information. Miscellaneous Media. wiring. Trailer Wiring Diagrams Wire to Wire Tow Vehicle Taillight Adapter for Chevrolet Colorado .Wiring New Trailer Tail Lights to a Trailer with Only Wires. To determine which wire is which you can plug the trailer up to a vehicle and have someone step on the brake pedal while you test the wires at the back Trailer Wiring Diagrams .