I got a wiring harness from circuit city and connected everything as usual, i have done this a hundred times, but no power to the radio or ground not sure which didnt have a volt meter. BUT there was another harness that plugged into the radio with only 1 wire in it, wondering if that was either power or ground. On the stock radio there was a wiring diagram and it said - 5P ILP COUPLER - whatever that means I'm not sure if anyone has ever run into this problem or knows what it could be any help would be appreciated thanks.