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What are the colors for the wireing on a gmc radio

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Red is switched power (only has juice when key is turned) yellow is constant power, black is ground, blue is accessories (amp or e.q.) dual grey, dual white, dual and dual others are for speakers..(usually the one with the marking is the positive side). I hope this helps.

Posted on Feb 01, 2010

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Door speaker wiring diagram for 2002 sierra


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Here ya go. enjoy!
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#510564: 2007 GMC SIERRA C1500 2DR TRUCK
Audio/Mobile Video
WIRE COLOR POLARITY LOCATION
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Accesory (CLASS 2 DATA) (+) RADIO HARNESS
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Steering Cntrls OPTIONAL
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Speed Cntrl OPTIONAL
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