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TM 10-3930-638-24&P
Section V. ELECTRICAL SYSTEM MAINTENANCE
This section contains the information you’ll need to maintain the:
l Batteries
l Starting system
l Charging system
l Lights
l Horn
It gives you instructions on how to troubleshoot problems and repair
or replace the components that are within the scope of organizational
maintenance.
Para
Troubleshooting Symptom Index. . . . . . . . . . . . . 2-19
Battery System Troubleshooting . . . . . . . . . . . . . . 2-20
Starting System Troubleshooting . . . . . . . . . . . . . . 2-21
Charging System Troubleshooting . . . . . . . . . . . . . 2-22
Horn and Back-up Alarm Troubleshooting . . . . . 2-23
Light Systems Troubleshooting . . . . . . . . . . . . . . . 2-24
Instrument Panel Troubleshooting. . . . . . . . . . . . . 2-25
Alternator Maintenance . . . . . . . . . . . . . . . . . . . . . 2-26
Starting System Maintenance . . . . . . . . . . . . . . . . . 2-27
Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-27a
Starter Relay and 25 AMP Circuit Breaker . . . 2-27b
Instrument Panel Maintenance. !. , . . . . . . . . . . . . 2-28
Flood Light Switches and Circuit Breakers . . . 2-28a
START Switch and VEHICLE LIGHTS Switch 2-28b
Ignition Switch and Circuit Breaker . . . . . . . . . 2-28c
Lockout Relay . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-28d
Warning Lights and Diodes . . . . . . . . . . . . . . . . 2-28e
Auxiliary Panel Maintenance ., ., . . . . . . . . . . . . . 2-29
Slave Receptacle . . . . . . . . . . . . . . . . . . . . . . . . . .
2-29a
Hourmeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-29b
Light Systems Maintenance . . . . . .
Para
. . . . . . . . . . . .
2-30
Flood Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Blackout Light . . . . . . . . . . . . . . . . . . . . . .
Rear Blackout Lights . . . . . . . . . . . . . . . . . . . . . .
Stop and Tail Light . . . . . . . . . . . . . . . . . . . . . . .
Sending Units and Switches Maintenance. . . . . . .
Fuel Gage Sending Unit . . . . . . . . . . . . . . . . . . .
Neutral Start and Back-up Alarm Switches . . .
Engine and Transmission Temperature Switches
Engine Oil Pressure Switch and Sending Unit .
Stop Light and Hydraulic Filter Switches. . . . .
Horn and Back-up Alarm Maintenance . . . . . . . .
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Back-up Alarm, . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery System Maintenance . . . . . . . . . . . . . . . . .
Battery Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Cables and Batteries . . . . . . . . . . . . . . . .
Wiring Harness Maintenance . . . . . . . . . . . . . . . . .
Front WiringH arness . . . . . . . . . . . . . . . . . . . . .
2-30a
2-30b
2-30c
2-30d
2-31
2-31a
2-31b
2-31c
2-31d
2-31e
2-32
2-32a
2-32b
2-32c
2-33
2-33a
2-33b
2-34
2-34a
Rear Wiring Harnes s . . . . . . . . . . . . . . . . . . . . . 2-34b
2-19. TROUBLESHOOTING SYMPTOM INDEX
NOTE
An electrical system wiring schematic is located at the back of this
manual in appendix F.
Para/Malfunction Page
BATTERY SYSTEM
All electrical systems are weak. ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-20/1
2-99
Batteries are hot or use excessive water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-20/2
STARTING SYSTEM
2-100
Starter cranks too slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-21/1
2-100
Starter fails to crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-21/2
2-101
Starter cranks continuously . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-21/3
2-103
2-98
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