GMC Sierra Trailer Wiring | etrailer Trailer Wiring Harness Installation - 2006 GMC Sierra. Today we are going to install a 4-pole and 7-pole connector by Hoppy, part number 30955, on a 2006 GMC Sierra. This wiring connector that we are installing goes right into the factory connector. So I would GMC Sierra 1500 Trailer Wire Harness and Connector - Best Order GMC Sierra 1500 Trailer Wire Harness and Connector online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store.
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