Dome Lamp: Description and Operation

The dome lamp receives power from the 10 Amp micro fuse located in the Power Distribution Center (PDC) on the M1 circuit. 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 ajar switches. Circuit M2 connects to all the door ajar switches from the dome lamp. The switches are case-grounded to the body. When a door is opened, the plunger in the switch closes, completing a path to ground.

The second ground path is through the headlamp switch. Circuit M2 is spliced in with the door ajar switches. When the operator turns the headlamp switch to the dome lamp ON position, a ground path is provided through the switch on the Z1 circuit. This ground terminates at the instrument panel left center support.