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take off the plastic housing and metal shield under the steering column the ignition wires are the big thick ones yellow is one of them, I would advise being careful with what you mess with under there you could cause other problems if things are done wrong. the gm upfitter guide may have more details on the wiresHello new guy here. I wanted to know if anyone here knows wire color codes under the steering column for ignition and for the driver side power mirror down left right up. I want to install a killswitch relay on a 2003 GMC Yukon. A friend of mines had one hooked to the side mirror down or left and to ignition wires and to start the truck he would push down or right to start it. He doesnt have truck no more and he didn't install it, he bought truck with it.
take off the plastic housing and metal shield under the steering column the ignition wires are the big thick ones yellow is one of them, I would advise being careful with what you mess with under there you could cause other problems if things are done wrong. the gm upfitter guide may have more details on the wires
also there is some really good information on a website called www.the12volt.com