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I have an 07 GMC Sierra Ext Cab 1500. I tow this truck behind my motor home. I am putting on the towing stuff and I have two problems. First, I have to find the brake light switch and cut into the "cold" side of the switch. I can't find the switch...it is not like in the old days and it is above the brake pedal. Secondly, I have cut into the tail lights and there are so many wires going to them I'm not sure what wires to cut. Does anyone have a wiring diagram of this truck or could tell me what what wires to cut and splice into?? Thanks...
Dennis...
 

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I have an 07 GMC Sierra Ext Cab 1500. I tow this truck behind my motor home. I am putting on the towing stuff and I have two problems. First, I have to find the brake light switch and cut into the "cold" side of the switch. I can't find the switch...it is not like in the old days and it is above the brake pedal. Secondly, I have cut into the tail lights and there are so many wires going to them I'm not sure what wires to cut. Does anyone have a wiring diagram of this truck or could tell me what what wires to cut and splice into?? Thanks...
Dennis...
I wonder if you could put in a trailer wiring harness that just plugs into the harness in the back and just run it to the front.

You know the kind that just plugs into the harness with a t in it that goes to the rest of the harness and then the t part goes to the trailer.

The system would be dead until you plug into the motor home, then live.

Not sure so don’t take my word for it, check it out.

This site may be helpful, not sure. There is a search button on the top that may be of some help.

http://www.etrailer.com/faq/wiring.aspx
 

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I am going to tow my '04 Z71 Crew Cab behind my motor home, also. I have a set of lights that Blue Ox sells that fits into the "receiver hitch" on the pickup bumper. You run wiring just like a boat trailer to the front of the truck and just plug it in, as you would a boat trailer. It doesn't have anything to do with your truck's wiring. You should be able to do the same with a set of movable lights and just attach them to the bed, when needed. Good luck!
 
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