TM 9-2320-273-20
Section II TROUBLESHOOTING
5-5. INTRODUCTION.
a. Scope. This section contains detailed troubleshooting information for locating and
correcting malfunctions in the electrical system. Each of the functional subsystems is treated
separately by means of:
(1) A physical and functional description.
(2) A circuit schematic.
(3) A brief overall subsystem check.
(4) Step-by-step test to diagnose problems using authorized test equipment,
b. Subsystem Circuits. The functional subsystem circuits covered in this section are
in the followlng sequence:
presented
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(1o)
(11)
(12)
(13)
(14)
Battery (table 5-1 ).
Starting (table 5-2).
Ether Quick-Start Control (table 5-3).
Engine Retarder Control (table 5-4).
Battery Charging (table 5-5).
Warning Lamps and Alarms (table 5-6).
Instruments and Indicators (table 5-7).
Headlamps (table 5-8).
Marker Lamps (table 5-9).
Parking and Tail Lamps (table 5-10).
Stop and Turn Signal Lamps (table 5-11).
Backup Lamps (table 5-12).
Blackout Lighting System (table 5-13).
Miscellaneous Electrical (table 5-14).
c. General Troubleshooting Procedures. The following procedures are general “in nature and
should be applied as appropriate during any electrical troubleshooting.
(1) Research the problem. Before you start detail troubleshooting procedures, review
the wiring diagram and schematic (Appendix D) to thoroughly familiarize yourself with the circuit(s)
involved. Analyze the symptoms and conditions and use common sense and logic to determine the
most likely cause for the problem, then troubleshoot that circuit first. The more information you
have concerning the problem, the easier it will be to troubleshoot.
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5-2
