Exterior Lamps; Service Lights/Blackout Control; Service And Blackout Lighting - GMC 2004 Defense Owner's Manual

Exterior Lamps

Service and Blackout Lighting

Notice: If the vehicle is not going to be driven for 24
hours or more, the service lights switch must be placed
in the "ALL OFF" position. This will help prevent drain on
the batteries.
Notice: Before normal driving operations, turn on service
lights to ensure headlights, brake lights and turn signals
are operational.
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Service Lights/Blackout Control

The switch located on the blackout switch panel next to
the 24-volt gage is the service lights/blackout control.
With the Ignition Switch in the ON Position:
•
Pull the switch outward then push upward to the
service ON position. All normal service lamps
will be operational with normal controls.
•
Move the service lights/blackout switch to the
center ALL OFF position. All lamps and accessory
power to the vehicle will turn off.
•
Move the switch to the blackout position, the
following will occur:
• The blackout lighting system will be operative.
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• The front and rear blackout marker lamps will
illuminate.
• The blackout stop lamps will illuminate when
the brakes are applied.
• The instrument panel warning lights will
remain functional.