Ok I got a wiring harness for my alpine and plugged in the 12 pins, but there is a another wire that has 3 connections. They are orange, orange/black and grey. I got my radio to work but want to know what do I do with the illumination wire. I see dimmer on the harness and know the switched 12v is the accessory which I put on the red and the yellow I connected to the orange. What do the colors mean. I just want to know.