Tail Light Wiring Kit for Flat Towing 2017 GMC Sierra

Question:

I want the sierra wired so its turn and tail light are used.

asked by: Kevin S

Expert Reply:

It sounds like you're trying to get a tail light wiring kit for flat towing your 2017 GMC Sierra 1500 behind a motorhome. I recommend using the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 which allows you to use your GMC Sierra's tail lights and wiring system while preventing feedback from your RV. This kit will allow both 2-wire and 3-wire systems to operate as a combined lighting systems and will provide you with exactly what you're looking for.

If you don't already have a battery disconnect system in place to make sure that your Sierra's battery doesn't drain during your tow, you can use the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766.

I've linked the installation videos of these two items to this answer so that you can follow along if you're installing these yourself.

expert reply by: Erik B