The following electrical wiring diagram is applicable for 2003 Harley Davidson VRSCA series. Herein you will find detail information about electrical connection, wire harness, electrical components and its function, also troubleshooting and repair of VRSCA electrical system. This motorcycle has 12 mm spark plug size with 0.89 mm gap using Harley-Davidson spark plug type no. 10R12A.
The topics cover in this manual includes bulb requirements, relay/fuse block, crank position sensor, ignition/lights switch, alternator, voltage regulator, battery, headlamp, tail lamp, cooling fans and etc.