Hi, new here to hdtalking. Does anyone out there have a user guide for the radio's that came stock on a 1989 electraglide? Would like to know if this radio has an aux feature. There seem to be additional wire coming out the back of this radio that don't have corresponding hookups on the bike. The handlebar controls work just fine but was wondering if these additional wires are for hooking up aux equipment, say for instance an ipod. Any help and maybe a user guide for this radio would be greatly appreciated....Thanks in advance.