Circuit Operation

With the Headlamp Switch in "HEAD" or "PARK," voltage is applied to one side of the Fog Lamp Switch. When the Fog Lamp Switch is closed, voltage is applied to one side of the Fog Lamp Relay Coil, energizing the relay (the other side of the coil is grounded through the High Beam Filament of the Headlamps).

When energized, the normally open contacts of the Fog Lamp Relay close, allowing voltage to be applied to the Fog Lamps.

When the High Beams are activated. current flow to ground is interrupted by opposing battery voltage from the Headlamp Dimmer Switch, de-energizing the relay and turning off the Fog Lamps.