Converting a 4-Pole Wiring Harness to 5-Pole on a 2004 VW Touareg for Towing a Boat Trailer

Question:

I just purchased the t pole adapter eletrics for the Touareg and my trailer is a 5 pole. How do I convert the 4 pole to a 5 pole connection. My trailer has surge brakes.

asked by: Jeff

Expert Reply:

Since you have the # 118509, custom wiring installed on your Touareg, you have two options. You can use the 4 Pole to 5 Pole Trailer Wiring Adapter, item # 47515, or you can cut the 4-Pole connector off of the harness and splice in a 5-Way connector, item # HM37908.

In either case the blue wire will be routed to the vehicle reverse light circuit, behind one of the vehicle tail lights, and spliced in there. Then, when the vehicle is in reverse, the electric lockout on your surge coupler will keep the brakes from being applied while backing.

expert reply by: Robert G