TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0012 00 0012 00-1 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 multimeters in resistance or continuity tests and voltage or 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.