TROUBLESHOOTING THE M998 ELECT SYST. - OD1617 - LESSON 1/TASK 1
indicator. The directional signal switch is also a standard military
unit.
A solid state flasher, located under the dash next to the
circuit breakers, pulses the directional lamps and provides a hazard
flashing feature.
(10) Electric Horn.
A single electric horn is mounted under the
hood, forward facing, near the front of the vehicle.
It is a
standard military 24 volt horn, activated by a horn button in the hub
of the steering wheel.
(11) Windshield
Wiper.
The
HMMWV
includes
a
windshield
wiper/washer system to maintain a clear field of vision through the
windshield. This system consists of a two-speed electric motor, two
wiper blades, blade linkage, washer reservoir, two washer jets,
connecting hoses, and a motor.
The motor is located inside the
vehicle at the top of the windshield and drives the blade linkage
inside the windshield header.
Dual ten inch blades are actuated by
the linkage, pivoting from the top of the windshield frame.
The
blades operate in unison and return to a park position at the right
side of the wipe pattern when the wiper switch is turned off.
Windshield washing is accomplished through two jets on the cowl below
the windshield. The fluid is contained in a reservoir located in the
engine compartment.
Always use an approved washing solution or
water; NEVER engine anti-freeze.
(12) Heater, Defroster, and Ventilation Mechanisms.
The heater,
defroster, and ventilation mechanisms are usually contained in one
unit to make up a complete system.
The unit, which is called a
heater unit, consists of a chambered box containing a heater core and
control doors which allow the operator to select the desired mode of
operation. The outside of the box contains openings for outside air
intake, allowing fresh air to be recirculated. The box also has an
interior air intake, so that inside air can be recirculated.
Defroster outlets are positioned to allow forced air to clear the
windshield.
Heater outlets are situated so that heated air can be
provided, usually at floor level.
Finally, ventilation outlets are
used so that air can be forced into the passenger compartment at the
instrument panel level.
An electric blower motor is also combined
with this unit to provide air movement.
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