ScottyBoy
Full Access Member
Well, that brown/white wire isn't the headlight wire. It IS the illumination wire. That wire is energized when the headlights or parking lights are on, and it powers the backlighting on all the buttons on every switch on the dash. Which includes the headlight switch, 4X4 switch, AC controls, and the radio. Now it has nothing to do with the radio screen, just the backlighting on the actual buttons. If you have an aftermarket stereo, then it might not even have the illumination wire connected, as most radios just have the buttons lit up the entire time the radio in on, not just at night when the headlights are on. So to make a long story short, if you had connected your power wire to the brown/white wire behind the radio, then it would work EXACTLY the same way its working being connected to the brown/white wire at the headlight switch because its the same wire.