I want to hook up an amp and a pair of subs to my factory deck in a 99 taurus wagon. I think I found the brain for the head unit in the spare tire compartment. Now I just need to find out what wires are the ones for the rear speakers so that I can hook up the Line out converter. If someone can tell me if this really is the brain that I found and what are the wire colors and position for the brains harness (is there and output and input harness?) I would really appreciate it.