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Are you referring to the trucks wiring harness? I hope you purchased an integration harness. Your truck has a databus system and an integration harness is needed to maintain certain functions including door chimes, warning chimes, on star (if equupped) etc. also the factory radio does not have a switched power lead to turn the radio power on with the key. That is also handled via databus.
DONT CUT ANY. Get an adapter from car toys or amazon etc. IF you do cut it, make sure you leave room to put it back on. The Chevrolet uses the radio for onstar and body information and you are in trouble if you make a mistake
the best thing to do is buy a wirng kit this will be plugs that match the factory plugs and wires will be marked as to how to wire new radio like speakers and power. if you go this route it is a basic install not hard and the kit is only around $15
Here ya go. enjoy! 2002 GMC Sierra C1500 Car Radio Wire Color Codes
Car Radio Battery Constant 12v+ Wire: Orange Car Radio Accessory Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black/White Car Radio Illumination Wire: Brown Car Stereo Dimmer Wire: Gray Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: Under the center console. Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue
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