I have a 99 expedition. Oem radio and speakers. I have an oem 8 in sub and enclosure with amp. I cant seem to find an accurate wire diagram. I need the pinout for the sub amp and the integration of it. I have narrowed it down to 2 possiblities. 1. It plugs directly into a dsp radio(an 8 pin socket) 2. which I think I have (plugs into a socket in another output of an amp.