Section V. ELECTRICAL SYSTEM MAINTENANCE

TM 10-3930-638-24&P

Section V. ELECTRICAL SYSTEM MAINTENANCE

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

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. ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-20/1

2-99

Batteries are hot or use excessive water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-100

2-20/2

STARTING SYSTEM

Starter cranks too slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-100

2-21/1

Starter fails to crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-21/2

2-101

Starter cranks continuously . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-103

2-21/3

2-98