RAM 3500 Truck 2WD V10-8.0L VIN W (1997)
Parking Brake Warning Lamp: Description and Operation
CIRCUIT OPERATION
Power for the parking brake lamp is supplied on circuit F14. This circuit is protected by a 15 amp fuse located in cavity 12 of the fuse block.
Ground for the lamp is supplied from two different sources. One way is on circuit G11. This circuit connects from the lamp to the park brake
switch located on the park brake mechanism. This switch is normally OPEN. When the switch CLOSES, a ground path is completed through the
case grounded switch. On vehicles equipped with Daytime Running Lamps (DRL), the G11 circuit is spliced and provides an input to the DRL
module.
The second ground path is supplied by the brake pressure warning switch. Circuit G9 connects from the lamp in the cluster to the switch. The
switch is normally OPEN. When the brake pressure is below a pre-determined pressure, the switch CLOSES and a ground path is completed
through the case grounded switch.
