Need to know what colors are for what and the function of each wire.
You can get the harness at WalMart or Best Buy. It connects to the aftermarket radio and then just plugs right in to the vehicles harness.....unless you already hacked it off. The thing only cost about $15.00 and makes the installation process a breeze.
2002 Chevrolet Tahoe Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Orange Radio Ignition Switched 12V+ Wire: Class 2 Serial Data Radio Ground Wire: Black/White Radio Illumination Dimmer Wire: N/A Radio Antenna Trigger Wire: Dark Green Radio Amplifier Trigger Wire: Pink (If equipped, the amplifier is under the center console.) Front Speakers Size: N/A Front Speakers Location: N/A Left Front Speaker Wire (+): Tan Left Front Speaker Wire (-): Gray Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Green Rear Speakers Size: N/A Rear Speakers Location: N/A Left Rear Speaker Wire (+): Brown Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Blue Right Rear Speaker Wire (-): Light Blue
