The following figure shows the wiring diagram of VW Vanagon model year 1990. This circuit shows the electrical connection between each parts and components that formed the starting system of the vehicle. The parts and components which formed the starting system are the ignition/starter switch, fuse/relay panel, starter cut-out/backup light switch, charging system, starter, battery, and many more. For more details, here is the schematic diagram :

VW Vanagon Starting System Circuit (click to enlarge)