2-61. AMBULANCE INTERIOR ELECTRICAL CONTROLS
General. The vehicle electrical system is used to power the NBC air filtration system, interior lights,
heater, air-conditioner, and ventilation system. It is recommended to have engine running while operating the
heater, vent, and NBC air filtration system so the alternator maintains battery charge. The engine must be
running to operate the air-conditioner compressor.
Electrical control panels on M996, M996A1, M997, M997A1, and M997A2
ambulances are basically the same (M997 is shown).
To facilitate blackout operations, M996, M996A1, M997, M997A1, and
M997A2 ambulance interior lighting systems have been designed so
that all white light illumination in the patient compartment will be
extinguished when bulkhead doors, rear doors, or rear steps are opened
unless the vehicle main light switch is in SERVICE DRIVE" position.
White Light Operation.
Place interior light switch (1) on electrical control panel (3) in "NORMAL" position. The blackout lights
Close bulkhead doors, rear doors, and steps. Ceiling white lights will illuminate and blackout lights will
To activate spotlights, engage switch on back of spotlight assembly.
If bulkhead doors, rear doors, or rear steps are opened, all white light illumination will be extinguished
and blackout lights will be illuminated.
Turn vehicle main light switch to SERVICE DRIVE" to operate interior white lights when bulkhead
doors, rear doors, or rear steps are open and blackout operation is not required.