Thanks for the info man. The black wire is the ground. Lets see if I can clarify this a little more. Theres a connector for the brake switch, consisting of 4 wires which of course includes the ground. My purpose is to switch the torque lock-up ON and OFF by splicing the ground wire into the POWER and the AC. I leave the ground alone. But now that I think about it, it seems almost impossible to illuminate it because I have no ground nor power to run from. This still sounds confusing...apologize for it. But I really want to get this to illuminate so that I will be able to tell for sure whether the switch is on of off.