Headlamp: Description and Operation

CIRCUIT OPERATION
The HEAD Relay in the fuse and relay box receives battery voltage at all times. When the light switch is turned to the head position, the coil of the relay is grounded through the light switch to G200. When a ground is provided, the HEAD relay energizes, and its contacts close. Voltage flows through the closed contacts of the Head Relay, the HEAD (LH) fuse and the HEAD (RH) fuse to the LH & RH low & high-beam filaments. since the LH & RH low beam filaments are permanently grounded at G104, they light. High-Beam selection is acquired by pushing the dimmer switch forward to the high position. When the dimmer switch is in the HIGH position, the LH & RH High beam filaments are grounded through the dimmer switch to G200.

Since ground is provided to the LH & RH high beam filaments, they light. If the light switch is in the HEAD position and the dimmer switch is pulled back to the PASS position, again, the LH & RH high beam filaments are grounded through the dimmer switch to G200 and they light. If the light switch is in the OFF position and the dimmer switch is pulled back to the PASS position, the LH & RH low and high beam filaments both light. When the dimmer switch is in the PASS position, a ground is provided to the coil of the HEAD relay. Since the HEAD relay receives battery voltage at all times, it energizes. The contacts of the HEAD relay are pulled closed and voltage flows through its contacts to the LH and RH low & high beam filaments. Since the LH & RH low beam filaments are permanently grounded at G104, they light. The LH & RH high beam filaments are grounded through the dimmer switch to G200. When grounded, they also light.