2003 Honda CBR 600 RR Main Wiring Harness The Main Wiring Harness typically runs the length of the bike, connecting all the electrical components of the bike, either directly or through sub-harnesses (e.g Gauge Harness, Engine Harness, etc.) A used Main Wiring Harness will be intact and in good condition. All plugs and connections will be clean, undamaged and in good condition. Sample Picture of Main Wiring Harness Shown, not necessarily the Main Wiring Harness for your bike. You will be shipped the correct part for a 2003 Honda CBR 600 RR Click here to see other parts for your motorcycle