BATTERY AND CHARGING SYSTEM TROUBLESHOOTING

TM 9-2320-361-24-1

0012 00

FIELD TROUBLESHOOTING

2-1/2 TON, 6X6, M44A2 SERIES TRUCKS (MULTIFUEL)

BATTERY AND CHARGING SYSTEM TROUBLESHOOTING

WARNING

Battery acid (electrolyte) is extremely harmful. Always wear

safety goggles and rubber gloves when performing battery

maintenance. Severe injury will result if acid contacts eyes or

skin.

Do not smoke, use open flame, or make sparks when

performing battery maintenance. Batteries may explode,

causing severe injury to personnel.

Remove all jewelry, such as rings, identification tags,

bracelets, etc. If jewelry or disconnected battery ground cable

contacts battery positive post, a direct short can result,

causing damage to equipment or severe injury to personnel.

When removing cables, disconnect the ground cable first. Do

not allow tools to come into contact with vehicle when

disconnecting cable clamps. A direct short can result, causing

instant heating of tools, tool damage, battery damage or

battery explosion, and severe injury to personnel.

CAUTION

During installation of battery terminals, ensure positive

clamps are installed on positive (+) posts and negative clamps

are installed on negative (-) posts. Failure to connect clamps

to correct posts will reverse polarity of circuitry and may

cause damage to rectifier diodes in alternator, vehicle wiring,

and radios (if equipped).

Do not use a hammer during installation of battery terminal.

Doing so may cause damage to equipment.

NOTE

Refer to general troubleshooting instructions in the

Introduction to Troubleshooting Work Package (WP 0004 00)

prior to performing any battery and charging system

troubleshooting.

The electrical systems troubleshooting procedures use

low ampere current tests. Multimeters may be found in the

Common no. 1 and no. 2 Unit Maintenance Automotive Shop

Sets.

The electrical wiring schematic for the M44A2 series truck

can be found in WP 0473 00.

0012 00-1