Even before we start discussing car stereo wiring diagrams, you should know that each vehicle company has a different wiring method. In addition to this, the car stereo wiring harness color codes also play an important role. It should be noted here in this wiring diagram that while the gray wire is the (+) for the right front speaker, the gray wire with black strips is (-) for the same one. Under the same logic, the white wires connect to the left front speaker, whereas the purple wire indicates the right rear speaker. However, the right-thumb rule for modern-day cars suggests that the red wire is switched power, and the white wire is the positive lead for the front left speaker.
