Fog Lamp

CIRCUIT OPERATION
The fog lamps operate only when the headlamp switch is in the ON position and the operator has selected LOW-beam operation. When the headlamps are in HIGH-beam mode, the fog lamps will not operate.

Power for the coil side of the fog lamp relay is supplied on circuit A3. This circuit originates in the PDC and is protected by a 40 Amp fuse located in cavity 15. Ground for the coil side of the relay is supplied on circuit Z1.

When the operator turns the fog lamps ON, circuit L39 from the switch is connected to circuit L95 at the junction block. Circuit L95 connects from the junction block to the coil side of the fog lamp relay.

Voltage flowing through the coil causes the contacts in the relay to CLOSE connecting circuit A3 and L39. The L39 circuit connects from the relay to the fog lamps.

Ground for the lamps is different for the left and right lamps. For the right fog lamp, the ground is provided on circuit Z1 and terminates at the right frame rail. For the left fog lamp, the ground is provided on circuit Z1 and terminates at the left strut tower.