TM-9-2320-361-20

TM 9-2320-361-20

Section VI. ELECTRICAL SYSTEMS TROUBLESHOOTING

2-14. GENERAL

a. This section provides information to diagnose and correct malfunctions of the electrical system.

Because of its complexity, the electrical system is divided into the following functional systems:

Battery System (page 2-77)

Starting System (page 2-79)

Charging System (60 amp) (page 2-89)

Charging System (100 amp) (page 2-95)

Charging System (25 amp) (page 2-98)

Lighting System (page 2-101)

Indicators, Gages, and Warning System (page 2-120)

Heating Systems (page 2-136)

Trailer Connection System (page 2-146)

b. The wiring schematic (Appendix E) shows the interrelationship of these systems and should be used

as a reference when performing electrical troubleshooting (table 2-4).

c. Each malfunction symptom given for an individual component or system is followed by step(s) you

should take to determine the cause and corrective action you must take to remedy the problem.

d. Before taking any action to correct a possible malfunction, the following rules should be followed:

(1) Question operator to obtain any information that might help you to determine the cause of

the problem.

(2) Never overlook the chance that the problem could be of simple origin. The problem could be

corrected with minor adjustment.

(3) Use all senses to observe and locate troubles.

(4) Use test instruments or gages to help you determine and isolate problems.

(5) Always isolate the system where the malfunction occurs and then locate the defective component.

(6) Use standard automotive theories and principles when troubleshooting the vehicles covered in

this manual.

e. Table 2-4 lists electrical malfunctions that may occur in individual systems of the vehicle. This table

covers electrical troubleshooting only. Troubleshooting procedures for the mechanical systems can be found

in table 2-2, section IV.

2-74

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