Tail Light Wiring Needed For 2014 GMC Sierra When Towed Behind Motorhome

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You have a couple of options to choose from to wire your 2014 GMC when towing your vehicle behind a motorhome. If you do not wish to cut and splice into the existing wiring on your GMC, I would recommend the Roadmaster Tail Light Wiring Kit with Bulbs, part # RM-155. This wiring option would require drilling a 1 inch hole in the back of each of your tail light assemblies to mount the bulbs from the lighting kit.

Another option would be the Roadmaster Universal Hy-Power Diode Wiring Kit, part # RM-154. this is a more intrusive installation, and requires cutting the wires behind the tail light assemblies. I have linked you to a video that shows the installation of this kit.

A third option would be the Roadmaster Standard Magnetic Tow Lights, part # RM-2120. This kit has a 25 ft long cable and has a round 4-way plug. Using this magnetic lights option would not require any cutting or splicing of wires, and would not require and drilling or alteration of your vehicle.

I have attached a few help articles that explain flat towing and wiring.

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Jeffrey L

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