Seven Prong Trailer Wiring. How to install new wiring or repair a bad connection. Trailer Wiring Diagram and Color Chart.
Installation of Pollak 7-Way Plug with 6 Colored Wires ... (Ronald Howell) Use two different colors of wire, such as red and black, so you can easily identify positive and negative. You could always have someone wire the rear lights so there is power at the bottom of the bumper. How to install new wiring or repair a bad connection.
I drew this crude diagram to help explain. power at the orange/yellow wire for the reverse lights (I assume thats what the wires are for).
Run two wires from the trailer end of the seven-pin connector to the trailer battery.
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You can access the required input signals at the Jetta's rear signal light housing. I definitely don't want something that will give it as much power as it can handle and start a fire, so I'm almost thinking. A wiring diagram is a simplified traditional pictorial depiction of an electric circuit.