Aftermarket Car Stereo Wiring Color Codes - A May 03, 2017Car Stereo Wiring Color Codes. by · May 3, 2017. The picture below shows the wiring color codes for a CEA aftermarket radio harness that is included with most radios. Brands like Pioneer, Alpine, Sony, Kenwood, JVC, Boss and Jensen.Author: Foraudiogeeks How to Identify Aftermarket Car Stereo Wire Colors If you have the pigtail that came with your aftermarket head unit, and it uses the standard colors, then the wires will have the following purposes and colors: Power Wires Constant 12V / Memory Keep Alive — yellow. Accessory — red. Dimmer/illumination — orange w/white stripe. Ground Wires Ground — black.