How Should 4-Way Round Vehicle End PK11404 Be Wired

Expert Reply:

If you are towing a vehicle with a motor home the 4-way round connections inside the vehicle end are usually as follows:

Top left: Yellow wire, Left turn and brake function.
Bottom left: White wire, ground wire.
Top right: Green wire, right turn and brake function.
Bottom right: Brown wire, tail light function.

There is not an industry standard wiring diagram for the 4-Way Round vehicle end, part # PK11404, so you may need to use a circuit tester, part # 3808 if needed, to check which pins are performing which function on your trailer, and connect the corresponding wires on the vehicle connector.

expert reply by: Sarah L