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Home > Ordnance Documents and other related manuals > > Electrical System - Od161570049
Task 1. Describe the characteristics and operation of the electrical system
Starter.

Introduction to the High Mobility Multi - Purpose Wheeled Vehicle (HMMWV)
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INTRODUCTION TO THE HMMWV - OD1615 - LESSON 4/TASK 1
2.
Electrical System
The  HMMWV  electrical  system  is  a  24  volt  system  capable  of  submerged
operation during fresh or saltwater fording.  It provides for starting the
vehicle, charging the batteries, and operating the controls, gages, and
accessory items peculiar to this vehicle.
In the paragraphs that follow, the components that comprise the electrical
system on the HMMWV will be discussed.  The electrical system on the HMMWV
consists  of  15  components as  follows:
batteries, alternator,  starter,
wiring  harness,  protective  control  box,  circuit  breakers,  instruments,
gages, indicators, lights, horn, windshield wiper/washer, heater/defroster,
slave receptacle, and trailer receptacle.
a. Batteries.  Two 12 volt batteries are connected in series to supply
the 24 volt current required to start and operate the engine and lights.
The batteries are mounted in an enclosed compartment under the right front
crew seat.  They are secured by a holddown clamp.  The batteries are joined
by a negative to positive jumper cable.  The remaining negative terminal is
connected  to  the  vehicle  ground,  while  the  other  positive  terminal  is
connected to the vehicle starter.  The batteries supply the necessary power
to the starter through the circuit designated SA in TM 9-2320-280-20.  This
circuit  connects  the  batteries  and  the  starter,  however,  it  is  also
connected to the power control box (PCB), which will be discussed later in
this text.
b. Alternator.
Most  military  vehicles  are  now  equipped  with
an
alternating current (ac) charging system.  The reason for changing to the
ac
system is that an alternator is capable of producing a higher voltage
at
idle speed.  Alternators convert mechanical energy to electrical energy
to
power the vehicle.
Many military vehicles are equipped with radios, firing devices, and other
high-current-drawing equipment.  When this equipment is in operation and the
vehicle's engine is operating at a low rpm, a dc generator will not produce
the current and voltage required to keep the batteries charged, plus supply
the current required to operate the accessories properly.
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