1979 where PO butchered stock harness to install an aftermarket stereo. I have everything connected except for the orange/white dimmer wire from the head unit. I can't figure out which wire on the car's harness is the correct dimmer wire. I've tried testing the wires coming from the headlight switch box but I'm not finding one that only comes on when the light switch is pull to ON.
What colored wire should I hook into ?
What colored wire should I hook into ?