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Page Title: Section V. ELECTRICAL SYSTEM MAINTENANCE
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TM 10-3930-638-24&P
This section contains the information you'll need to maintain the:
Batteries
Starting system
Charging system
Lights
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
Para
Light Systems Maintenance . . . . . . . . . . . . . . . . . .  2-30
Troubleshooting Symptom Index. . . . . . . . . . . . . 2-19
Battery System Troubleshooting . . . . . . . . . . . . . . 2-20
Flood Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30a
Front Blackout Light . . . . . . . . . . . . . . . . . . . . . .  2-30b
Starting System Troubleshooting . . . . . . . . . . . . . . 2-21
Rear Blackout Lights . . . . . . . . . . . . . . . . . . . . . .  2-30c
Charging System Troubleshooting . . . . . . . . . . . . . 2-22
Stop and Tail Light . . . . . . . . . . . . . . . . . . . . . . .  2-30d
Horn and Back-up Alarm Troubleshooting . . . . . 2-23
Sending Units and Switches Maintenance. . . . . . .  2-31
Light Systems Troubleshooting . . . . . . . . . . . . . . . 2-24
Fuel Gage Sending Unit . . . . . . . . . . . . . . . . . . .  2-31a
Instrument Panel Troubleshooting. . . . . . . . . . . . . 2-25
Neutral Start and Back-up Alarm Switches . . .  2-31b
Alternator Maintenance . . . . . . . . . . . . . . . . . . . . . 2-26
Engine and Transmission Temperature Switches 2-31c
Starting System Maintenance . . . . . . . . . . . . . . . . . 2-27
Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27a
Engine Oil Pressure Switch and Sending Unit .  2-31d
Stop Light and Hydraulic Filter Switches. . . . .  2-31e
Starter Relay and 25 AMP Circuit Breaker . . . 2-27b
Horn and Back-up Alarm Maintenance . . . . . . . .  2-32
Instrument Panel Maintenance. !. , . . . . . . . . . . . . 2-28
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-32a
Flood Light Switches and Circuit Breakers . . . 2-28a
Horn Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-32b
START Switch and VEHICLE LIGHTS Switch 2-28b
Back-up Alarm, . . . . . . . . . . . . . . . . . . . . . . . . . .  2-32c
Ignition Switch and Circuit Breaker . . . . . . . . . 2-28c
Lockout Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28d
Battery System Maintenance . . . . . . . . . . . . . . . . .  2-33
Warning Lights and Diodes . . . . . . . . . . . . . . . . 2-28e
Battery Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-33a
Battery Cables and Batteries . . . . . . . . . . . . . . . .  2-33b
Auxiliary Panel Maintenance ., ., . . . . . . . . . . . . . 2-29
Slave Receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29a
Wiring Harness Maintenance . . . . . . . . . . . . . . . . .  2-34
Hourmeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29b
Front WiringH arness . . . . . . . . . . . . . . . . . . . . .  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. ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Batteries are hot or use excessive water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STARTING SYSTEM
Starter cranks too slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter fails to crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter cranks continuously . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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