CET1

My BIL just bought this truck. We purchased a new wiring harness for the right rear lights but where the harness plugs in under the truck all the pins are corroded off. Where can I splice into the signal. If I use the trailer wiring I get a code on the dash.

Thanks. 898 pages was a little much to navigate. I tried but didn't find what I needed. You are pretty close to me, I'm in Queensville.

I have a 2015 Sierra 1500 that I just bought. The previous owner has jumped the rear right signal wire to the trailer wiring to get the signal to work. Does anyone know where I can get a layout of the wiring block that is behind the spare tire to see which wire is supposed to actually go to the right signal? Thanks.