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 00-26 BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. NO ALTERNATOR OUTPUT Test 2. Test charging system output voltage. NOTE • Voltage regulators in both the 100 amp and 60 amp charging systems regulate battery voltage to 28.0 ± 0.2 VDC. • The 100 amp voltage regulator is separate from the 100 amp alternator. • Battery voltage fluctuations are not to go above 28.5 VDC or below 27.5 VDC as headlights are turned on, off, and on with engine running at 1200 RPM. • For test purposes only, charging voltage across batteries can be varied between 26.0 and 30. 0 VDC with engine running at 1200 RPM and headlights off. 1. Turn off engine. 2. Open door of battery compartment. Loosen two thumbscrews and slide batteries onto running board (WP 0127 00). 3. Use multimeter to check battery for voltage. 4. Start engine (TM 9-2320-361-10). 5. Set engine speed at 1200 RPM. 6. Turn on vehicle headlights and accessories. Table 4. Charging System (100 Amp) Troubleshooting Procedure (Contd). TEST 2 STEP 7 BATTERIES THUMBSCREWS RUNNING BOARD ~ ~