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TM-9-2320-361-24-1 Page 211

TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks

Page 211 of 1176


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TM 9-2320-361-24-1 0012 00 0012 00-27/28 blank BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. NO ALTERNATOR OUTPUT CAUTION Do not puncture waterproof cover on cable between alternator and voltage regulator to perform voltage checks. The cable will be unserviceable. 7. Use multimeter to check battery voltage. Normal charging on batteries is 28.0 ± 0.2 VDC. 8. Check voltage regulator stability. 1. If battery voltage measures between 24.0 and 26.0 VDC and alternator has very weak or no output, replace alternator (WP 0085 00). 2. If battery voltage measures between 26.0 and 30.0 VDC, adjust voltage regulator (if equipped with adjustment screw). If charging voltage across batteries cannot be adjusted to 28.0 ± 0.2 VDC, replace voltage regulator (WP 0448 00). 3. If charging voltage across batteries can be adjusted to 28.0 ± 0.2 VDC., go to test step 8. Go to WP 0012 00, table 2, malfunction 1, test 2, step 7. 2. BATTERIES NOT CHARGING PROPERLY NOTE If STE/ICE-R is available, perform NG 50 Charging Circuit Tests (WP 0018 00). Test 1. Check for loose or missing alternator belts. Test 2. Test battery voltage. 1. Adjust loose belts (WP 0084 00). 2. Replace broken or missing belts (WP 0084 00). Go to WP 0012 00, table 1, malfunction 1, test 1. 3. BATTERIES HOT OR BOILING, CORRECTED SPECIFIC GRAVITY OF ALL CELLS IS 1.280 NOTE If STE/ICE-R is available, perform NG 50 Charging Circuit Tests (WP 0018 00). Test charging voltage (WP 0012 00, table 4, malfunction 1, test 2). Replace defective batteries as necessary (WP 0127 00). 4. BATTERIES USE EXCESSIVE WATER NOTE If STE/ICE-R is available, perform NG 50 Charging Circuit Tests (WP 0018 00). Test charging voltage (WP 0012 00, table 4, malfunction 1, test 2). Replace defective batteries as necessary (WP 0127 00). 5. BATTERIES RUN DOWN IN OPERATION NOTE If STE/ICE-R is available, perform NG 50 Charging Circuit Tests (WP 0018 00). Test 1. Check for loose or missing alternator belts. Test 2. Test charging voltage (WP 0012 00, table 4, malfunction 1, test 2). 1. Adjust loose belts (WP 0084 00). 2. Replace broken or missing belts (WP 0084 00). Table 4. Charging System (100 Amp) Troubleshooting Procedure (Contd). END OF WORK PACKAGE