Hi Guys:

I have a 2008 Yukon XL 1500. In connecting a 3ed party break controller, all seems normal until I get to the blue/white wire.

The two red wires are connected at the fuse box under the hood. Under the stearing wheel I found 4 wires. The white one is ground, the red wire has 12V all the time. The blue connects to the break controller and the blue/white wite is the signal. The blue/white wire has 12V all the time. I expected this to toggle on and off with the break peddle. What is your likely assumption or is there something I should verify? At this point I'm ready to shotgun the break peddle switch. Any suggestions?

 

Welcome.

brake pedal.

You're going to need schematics. See if you can find one on charm.li

 

Clearfication to my original set of questions. Does the blue/white wire toggle 12V when pushing the break peddle?

 

again,

 

Hi Guys:

Replaced the break peddle switch and the signal wire started toggleing correctly,

Thanks for all the comments, good luck with all your GMC repairs!

dh

 

LOL.
Brake pedal in English. Thanks for reporting back.