Wiring for VW Headlight Switches and Relays. - jbugs 133941531B VW Headlight Switch: VW Super 1973-79 Replacing the Headlight Switch (and most all the VW Switches) is very simple. The headlight terminals are numbered, their designations are: 30 - Battery Power from the Fuse Box 30 - 2nd 30 terminal not typically used 56 - Power to Headlight Relay 58 - Power to the Running Light Terminal on the Wiring a light switch? Here's how. - Easy Do It Yourself Connect the "source" wire to the bottom terminal of the switch and the other black wire to the top terminal. In this picture, you can see the strip gauge on the back of the switch. This gauge is when you want to use the "quick-connect" method when wiring a light switch. Simply strip the wire to the length specified and push the wire into the hole.