
Installed on 03 Silverado with Onstar, timing and navigation mirrors. I saw reviews where people try to sharpen plug taps and pierce wires behind the mirror, everything is much easier! For my truck and most likely the GMC Sierra, the yellow wire was power and the black wire was ground. You just have to be careful with the cables as the wires are very thin. Don't be a gorilla, don't rush to put the roosters in the fork! Mine didn't go all the way into the transom cap, but the radar works fine. The smaller faucets they supply come in handy with a variety of factory tableware styles!

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