Fog Lamps - Chevrolet Domestic, Gulf, Japan, Pontiac

The fog lamps can be turned on by the fog lamp switch only when the parking lamps are on and the high beam headlamps are off.

The headlamp switch supplies battery positive voltage to the fog lamp switch and the fog lamp relay contacts, when the headlamp switch is in the PARK or HEAD position. The fog lamp relay coil is grounded thought the inactive high beam headlamps. When the fog lamp switch is place in the ON position, battery positive voltage is applied to the coil side of the fog lamp relay, energizing it. When the fog lamp relay energizes, the relay contacts close and it supplies battery positive voltage to fog lamps. The fog lamps are grounded at G 105 and G 106.

The fog lamps will remain ON until any of the following actions occurs:
^ The headlamp switch is placed in the OFF position.
^ The high beam headlamps are turned ON.
^ The front fog lamp switch is placed in the OFF position.

The fog lamp switch indicator illuminates when the fog lamp switch is in the on position and the park lamps are on. The indicator receives battery positive voltage from the fog lamp switch when the switch is in the ON position. The indicator is grounded at all times.

For the Pontiac, the fog lamp switch indicator illuminates when the fog lamp switch is in the on position and the park lamps are on also, but the Pontiac fog lamp switch indicator receives battery positive voltage from the fog lamps supply voltage circuit when the fog lamps illuminate. The indicator is grounded at all times.