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Ok, I installed an aftermarket cd player/radio (Pioneer) in my truck. I used a wiring harness to make it easier. I have done this a time or two, but am not that much of an expert. I noticed that I didn't have a place to hook up the black wire from the CD player. Isn't that the ground wire? If so, anybody know where I should hook it up to? There was a mystery wire hooked to the body of the stock radio/tape player, I think it was blue. Wasn't sure what it was for, though but didn't think it was the ground. Any ideas?