Hey guys, I need help with trying to wire my rear spoiler tail light to my brake light system. I have it mounted and everything now now just need to connect the wiring. The spoiler light wiring has 2 wires, a red and a black wire. I looked at the wiring harness and connected the red wire to the green/red wire of the harness and the black wire to the black/grey (am assuming it was supposed to be black/white, but there was none and I think the grey was originally white) there are 2 black/grey wires but the other one has yellow box like things on it as well. All said an done and connected the spoiler light turned on when the car was off, I turned on the car and turned on the headlights and the spoiler light went off. I turned the car and headlights off and the spoiler light went on again. If you can help me with this problem I would greatly appreciate it! Thanks!!!!