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Home > Ordnance Documents and other related manuals > > Wiring Design. - OD161680045
Alternator.
Driver's  Compartment.

Troubleshoot The High Mobility Multi- Purpose Wheeled Vehicle (HMMWV)
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TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 2
for  cranking  the  engine  with  an  electric  motor  was  developed  as
automotive  technology  progressed.
The  modern  electric  starting
system has reduced the task of starting an internal combustion engine
to the turn of a key or the pushing of a button.
The starter may
drive the engine through a pinion or by a dog clutch attached to the
starter armature shaft.  The shaft is brought together with the teeth
cut on the rim of the flywheel or with the mating half of the dog
clutch.
The drive must be equipped with an overrunning clutch or
some other means of quick disengagement.
Owing to limitations of
size and capacity of the battery, a high-speed starter with a high
gear reduction is used to obtain the necessary torque.
The great
speed reduction required is affected in the majority of cases by
using the flywheel as a driven gear.  In some instances, the gear is
bolted or shrunk on the flywheel; while in others, the gear teeth are
cut directly in the rim of the flywheel itself.
The starter is
mounted on the flywheel housing.
The starter used on the HMMWV is a 24 Volt unit activated by the
RUN/START switch through a  solenoid mounted on the  starter motor
housing.
The switch is placed to the RUN position and the WAIT TO
START lamp illuminates.  A relay in the protective control box (PCB)
energizes the glow plugs and after approximately six seconds, the
WAIT TO START lamp will extinguish.  The vehicle may now be started
by positioning the switch to the START position.
The starter will
engage the crank and the engine.  Releasing the switch allows it to
return to the RUN position.
In other words, the switch is spring-
loaded to the RUN position.  An ac output from the alternator to the
PCB prevents the starter from re-engaging once the engine is running.
A  neutral  (safety)  switch  mounted  in  the  transmission  quadrant
prevents  the  vehicle  from  being  started  in  any  gear  other  than
neutral (N).
(4) Wiring Design.  The vehicle wiring design uses a harness-type
construction and a modular approach that separates the harness into
four major sub-assemblies.
These sub-assemblies are: engine, body,
simplified test equipment/internal combustion engine (STE/ICE), and
hood.  These harnesses have multi-circuit disconnects for removal of
the major assemblies for maintenance.
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