7 Round Pin Trailer Connector Wiring Diagrams. Trailer Wiring Diagrams for Single Axle Trailers and Tandem Axle Trailers. This contact is less common, and may have completely different wiring than that shown here.
The three additional pins are: trailer brakes, back-up lights and eTrailer: Trailer Wiring Diagrams. The problem is, the wires broke inside the trailer's connector so I can't tell what went where. Splice the seven-pin trailer plug leads to the trailer harness.
If the problem persists, you may need to.
The seven-pin connector trailer wiring harness, is located at the rear of the vehicle and is tied to the vehicle's frame.
The three additional pins are: trailer brakes, back-up lights and eTrailer: Trailer Wiring Diagrams. Check out or trailer wiring diagrams for a quick reference on trailer wiring. The harness connector can be plugged into a seven-pin universal heavy-duty trailer connector available through your dealer.