UNIVERSAL STEREO WIRING DIAGRAM

Aftermarket Car Stereo Wiring Color Codes - A
Are Radio wiring Harnesses Easy To install? Generally, when installing a new car stereo into your vehicle you’ll need an aftermarket wiring harness that clips onto the factory harness you pulled off of the back of your factory radio during its removal. You Are essentially continuing the flow of an electrical circuit when your connecting a wiring harness for your stereo.
3 Audio Jack (TS, TRS, TRRS Type Audio Jack) Wiring
Now-a-days 3 is the universal audio jack size to be found in Smartphones, PC and Laptops. Also, for hobbyists 3 audio jack is a useful components for projects that plug into headphone jacks. There are different types of 3 audio jack available with different application like TS, TRS, and TRRS, but the most common that we see in daily life is TRS and TRRS.
Connectors for car audio - Wikipedia
Splicing wires. Splicing wires used in car audio are mainly for power, ground, amplifier and antenna, speakers, phone and others. Power and ground. ACC (red), supplies +12V power to car audio and other accessories, only when the car's ignition is switched on.; Constant (yellow), also called BAT or Battery, provides permanent +12V power from battery.