What happens if you disconnect the yellow wire from the stereo?
What happens if you disconnect the yellow wire from the stereo? If you disconnect the yellow, the stereo will still work it just won't store presets, time etc. Disconnect the red (leaving yellow connected) and the stereo will not turn on. 'Scorpio65 writes... Most (if not all) will use the power from the red wire. What's the difference between yellow and red wire? Yellow wire is constant, keeps memory, clock, settings, etc alive, and supplies power to headunit. Red is ACC, signal wire to turn on and off. Depending on stereo, it will use power from either. I know kung...