MCS-588900 - With 6 position Molex plug for 5-wire trailer. A trailer requires power for lighting. The Trailor Isolator is Plug & Play and sends power; used for the trailer; directly from the battery to trailer through a bank of 4 relays. The Trailer Isolator gets the

Fitment:
14-21 Ultra Limited; 15-21 Road Glide Ultra; 14-21 Road King (excl. Road Glide Special); 14-21 Police models