Our comprehensive 2003 Chevrolet Silverado 1500 radio wiring diagram shows all the radio wire harness colors, speaker wire colors, and speaker sizes. Use this head unit pinout guide to help with your car stereo installation or to troubleshoot radio wiring issues in your 2003 Chevrolet Silverado 1500.. Find the correct stereo wiring diagram for your 2003 Chevrolet Silverado and upgrade your audio system with ease.
Right Rear Speaker Negative Wire (-): Light Blue Stereo Amp Wire (+): Blue/with white stripes The following information is currently not available: Stereo Amp Trigger Wire Audio Front Speakers Size Audio Rear Speakers Size *If you know any of the above or any other missing information please use the comment box below to notify us.. 2003 Chevrolet Silverado Stereo Wiring Information Radio Battery Constant 12v+ Wire: Orange Radio Accessory Switched 12v+ Wire: Class 2 Serial Data Radio Ground Wire: Black/White Radio Illumination Wire: Red/Blue Stereo Amp Trigger Wire: Pink Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front.