TM 9-2320-272-24-1
2-22. ELECTRICAL SYSTEM TROUBLESHOOTING
a . This section provides information to diagnose and correct malfunctions of the electrical system.
Because of the complexity, the electrical system is divided into the following functional systems:
l Engine and Vehicle Electrical System (page 2-95)
l Battery System (page 2-97)
l Starting System (page 2-101)
l Generating System (page 2-118)
l Lighting System (page 2-124)
l Directional Signal System (page 2-135)
l Ether Start System (page 2-141)
l Indicator, Gauge, and Warning System (page 2-145)
l Trailer Connection System (page 2-163)
l Heater System (page 2-165)
l 100-Amp Alternator Kit (page 2-169)
l Transfer Case System (page 2-174)
l Protective Control Box Assembly (page 2-176)
b . Principles of operation showing wiring diagrams for each system can be found in chapter 1. The
wiring schematic (appendix H) shows the interrelationship of these systems. Both should be utilized as
references when performing electrical troubleshooting (table 2-3).
c . Each malfunction symptom given for an individual component or system is followed by step(s) that
should be taken to determine the cause and then corrective action that must be taken to remedy the
problem.
d . Before taking any action to correct a possible malfunction, the following rules should be followed:
(1) Question the vehicle operator to obtain any information that might help determine the cause of
the problem.
(2) Never overlook the chance that the problem could be of a simple origin. The problem could be
corrected with minor adjustment.
(3) Use all senses to observe and locate troubles.
(4) Use test instrument or gauges to help determine and isolate problems.
(5) Always isolate the system where the malfunction occurs and then locate the defective
component.
(6) Use Principles of Automotive Vehicles, TM 9-8000, when troubleshooting vehicles covered in
this manual.
e. Table 2-3 lists electrical malfunctions that may occur in individual units or systems of the vehicle.
This table covers electrical troubleshooting only. Troubleshooting procedures for the mechanical systems can
be found in table 2-1, para. 2-21.
f. This section cannot list all the electrical malfunctions that may occur. If a malfunction occurs that is
not listed in table 2-3, notify DS maintenance.
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