Connect the wires as indicated below
1999 Chevrolet Silverado C1500 Wiring, aftermarket stereo wire colors
Car Radio Battery Constant 12v+ Wire: Orange, yellow
Car Radio Accessory Switched 12v+ Wire: Yellow, red
Car Radio Ground Wire: Black, black
Car Radio Illumination Wire: Gray (Tape off) not used
Car Stereo Dimmer Wire: Brown (Tape off) not used
Left Front Speaker Positive Wire (+): Tan, white
Left Front Speaker Negative Wire (-): Gray, white/black
Right Front Speaker Positive Wire (+): Light Green, gray
Right Front Speaker Negative Wire (-): Dark Green, gray/black
Left Rear Speaker Positive Wire (+): Brown, green
Left Rear Speaker Negative Wire (-): Yellow, green/black
Right Rear Speaker Positive Wire (+): Dark Blue, purple
Right Rear Speaker Negative Wire (-): Light Blue, purple/black
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