The Kuryakyn 7672 plug and play trailer wiring and relay harness are new and improved for Harley-Davidson bikes. Safely and effectively apply the load from your trailer lighting to the battery and not to the rest of the bikes electrical system. These eliminate blown fuses caused by overlooking stock lighting or accessory circuits. Relay harness utilized inputs from the motorcycle to direct power from the battery to the appropriate trailer lighting circuit. Includes (1) trailer wiring isolation relay, (1) trailer sub harness, (1) inline fuse and Y-wire assembly with heat shrink covered butt connectors, (1) hardware kit, (1) alcohol pad; suggested tools for installation (not included): set of hex wrenches, combination wrenches, side cutter, electrical tape, set of screw drives, test light or multi meter. Kuryakyn 7672 plug and play trailer wiring and relay harness is compatible with Harley-Davidson models: '97-'13 Electra Glides, '98-'13 Road Glides, (excludes '09 FLTRSE, '10-'13 FLTRX & '12-'13 FLTRXSE), '97-'13 Road Kings, (excludes '13 FLHRSE), '06-'09 Street Glides, '09-'13 Trikes, '96-'10 Softails, (excludes 08-'10 FXCW/C & '10 FLSTSE), '97-'11 Dyna's, (excludes '10-'11 FXDWG).