USA

Low Beams
The headlight relay receives battery voltage at all times. When you turn the headlight switch to the HEAD position with the dimmer switch in LO, ground is applied at the BLU/BLK wire to the coil of the headlight relay. The relay is then energized, applying battery voltage to the left and right high and low beam headlights through fuses 19 and 20. The low beam bulbs come ON because the opposite terminal is tied to ground. The high beam bulbs and indicator remain OFF because the ground path to these bulbs is interrupted by the deactivated dimmer relay.

High Beams
When you pull the dimmer switch to HI with the low beams already ON, a ground signal is applied to the dimmer relay from the dimmer switch. This energizes the dimmer relay, applying ground to the high beam bulbs and high beam indicator, which turns ON the high beams and indicator light. The low beam headlights stay ON (see Low Beams).

Flash-to-Pass
When you hold the flash-to-pass switch in the ON position, ground is applied to the BLU/BLK wire to the coil of the headlight relay and at the RED/BLU wire of the dimmer relay. This energizes the headlight relay, applying battery voltage to the low and high beam bulbs and to the dimmer relay. As the low beam bulbs receive battery voltage, the dimmer relay is energized, applying ground at the RED/BLU wire to the high beam bulbs and high beam indicator which turns ON the high beams and indicator light.