TROUBLESHOOTING THE M998 ELECT SYST. - OD1617 - LESSON 1/TASK 1
2.
Electrical System
In order to effectively troubleshoot any of the various HMMWV
components and systems, maintenance personnel must first understand
the operation of the system they are troubleshooting. The purpose of
this task is to introduce the student to these components, and to the
operation of the HMMWV electrical system.
The electrical system on any vehicle serves an indispensable purpose.
Without the electrical system, most vehicles could not be started.
Also, it would be impossible to operate the vehicle at night since
there would be no external or internal lighting. Additionally, there
would be no way for the operator to monitor such vehicle operations
as speed, engine coolant, oil pressure, and a multitude of other
items that must be constantly checked to ensure correct vehicle
operation. In this lesson, the characteristics and operation of the
HMMWV electrical system will be discussed.
a.
Electrical System Components. 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.
b.
In the paragraphs that follow, the components that comprise the
electrical system on the HMMWV will be discussed.
The system
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