3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Dome Lamp: Description and Operation
CIRCUIT OPERATION
Circuit M1 from the IOD fuse (fuse 17) in the fuse block supplies power to the dome lamp. This circuit is HOT at all times. The ground path for
the lamp is provided in two different ways.
One way is through the door jamb switches. Circuit M2 connects to the door jamb switches from the dome lamp. The switches are connected to
ground circuit Z3. when a door is OPENED, the switch CLOSES, completing a path to ground on circuit Z3.
The second ground path is through the headlamp switch. Circuit M2 is spliced in with the headlamp switch. When the operator turns the headlamp
switch to the dome lamp ON position, a ground path is provided through the switch on circuit Z3.
