GM Headlight Switch Circuit Functions

GM Headlight Switch Circuit Descriptions:

0. Ground output wire through the rheostat.
1. 12 volt battery unfused feed into H/L switch circuit breaker
• Feeds power to #7 when headlight switch is in “Park lights on” position.
• Feeds power to #6 when headlight switch is in “Headlights on” position.
2. Draws Power from #5 12 volt fused battery “PARK LIGHT” feed.
• Feed to Instrument panel lights fuse on fuse panel.
• Also has continuity with #3, #4, #5
3. Usually hard wired to #4 by brass strip on surface of headlight switch.
• Optional “full time” parking lamp feed
4. Draws Power from #5 12 volt fuse battery “PARK LIGHT” feed.
• Comes on when headlight switch is in “Parking Lights On” position.
• Stays on when headlight switch is in “Headlights On” position.
5. Fuse 12 volt battery feed from fuse panel
• Provides power to #2, #3, and #4
6. Main Headlight power out to Dimmer switch through internal circuit breaker
• From #1 12volt battery feed
7. Draws Power from #1 12 volt battery feed to feed parking lamps.
• Used for pre-1968 parking lights.
• Goes on when headlight switch is in “Parking Lights On” position. (1st click)
• Goes off when headlight switch is in “Headlights On” position. (2nd click)