Adding 4-Way Trailer Harness To 2013 GMC Sierra With Factory 7-Way

Published 12/02/2015

Question:

My 2013 GMC Serria has a factory plug. What product do I need to put a t behind the bumper to plug in my bar lights. and still have the 7 pin plug working?

asked by: Jim R

Expert Reply:

To add a 4-way connector to your Sierra I recommend the Tow Ready T-One Wiring Harness, part # 118384. This plugs into the vehicle wiring under the rear of the truck by the bumper and allows you to retain your 7-way connector while giving you a 4-way as well.

If you wish to change your factory connector to a 7-way and 4-way combined the connector I recommend for your 2013 Sierra is the Hopkins Multi-Tow 7-Way and 4-Way Trailer Connector, part # 30955.

This installs in the factory plug located under the vehicle near the bumper above the spare tire. Simply plug it in and you have a working 4-way connector for the lights and a working 7-way for your trailer.

Another connector that is designed to work with your truck is the Pollak 7- and 4-Pole Trailer Connector Socket, part # HM40975. The design of the doors on this plug will only allow you to be able to use one of the connectors at a time.

expert reply by: Jeffrey L