TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. NO ALTERNATOR OUTPUT NOTE • Voltage regulator is built into alternator. • If STE/ICE-R is available, perform NG 50 Charging Circuit Tests (WP 0018 00). Test 1. Check for loose or missing belts. Test 2. Test charging system output voltage. NOTE If vehicle is equipped with a slave receptacle, check voltage at receptacle. 1. Open door of battery compartment. Loosen two thumbscrews and slide batteries onto running board (WP 0127 00). 2. Start engine (TM 9-2320-361-10). 3. Set engine speed at 1200 RPM. 4. Turn vehicle headlights and accessories to ON position. 5. Use multimeter to check battery voltage. Charging voltage on batteries should be 28.0 ± 0.2 VDC. 1. Adjust loose belts (WP 0084 00). 2. Replace missing belts (WP 0084 00). 1. If battery voltage measures 24.0 VDC, alternator has no output. Go to test 3 and check input voltage. 2. If battery voltage is between 24.0 and 26.0 VDC, alternator output is weak. Go to test 3 and check input voltage. 3. If battery voltage measures 28.0 ± 0.2 VDC and voltmeter on instrument panel shows no voltage, an electrical problem exists between alternator and power accessory switch. Go to WP 0012 00, table 2, malfunction 1, test 4, step 3. 4. If battery voltage measures between 26.0 and 30.0 VDC, adjust voltage regulator (WP 0085 00) in alternator until voltage across batteries is 28.0 ± 0.2 VDC. Go to test step 6 and check regulator stability. TM 9-2320-361-24-1 0012 00 0012 00-19 BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd) Table 3. Charging System (60 Amp) Troubleshooting Procedure.