Fits 2006 GMC Sierra wiring but power connectors are mismatched or in the wrong place (UNIVERSAL KIT). You will need a second wire going to the A/C/heater control box under the radio to provide the required 12v ACC. The second red wire connects to the red wire on the wiring harness and everything works fine. You need to tie to the brown AC control wire. The other kits here have a second red wire, this one doesn't. Check YouTube, there was only 1 video explaining this and it doesn't explain it very well.
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