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. STARTER WILL NOT CRANK (Contd) 4. Remove leads 11 from pins A and C and lead 1 from pin D. With power accessory switch in ON position, check continuity between pins A and B and between pins C and D. 5. Remove lead 74A from pin B of start switch. With power accessory switch in ON position, turn start switch and check for battery voltage at pin B. 6. Remove lead 74 from pin A of start switch, turn power accessory switch to ON position, and check for battery voltage at pin B. 7. Attempt to start engine (TM 9-2320-361-10). 8. Remove lead 74 from pin A and lead 74A from pin B of start switch. Turn start switch and perform continuity check between pins A and B. Test 4. Check for battery voltage at horn circuit breaker. 1. Remove lead 10 from horn circuit breaker and check battery voltage on contact end. 2. Disconnect battery ground cable (WP 0126 00). Disconnect leads 11 from power accessory switch and check continuity of two leads 10 and lead 11. 1. If continuity is not found, replace power accessory switch (WP 0104 00). Check continuity of new power accessory switch before installation. Reinstall leads 11 in pins A and C. Reinstall lead 27 in pin B and lead 1 in pin D. Attempt to start engine (TM 9-2320-361-10). 2. If starter does not crank engine, go to test step 5. 1. If voltage is not present, go to step 6. 2. If voltage is present, perform continuity check on lead 74A 3. If continuity is present, repair or replace lead (WP 0090 00). 1. If voltage is not present, disconnect lead 27 from power accessory switch and check continuity between lead 27 and its connection to lead 74. 2. If continuity is not found, repair or replace lead. Reinstall lead 74 into pin A. If starter does not engage engine, go to test step 8. 1. If continuity is not found, replace start switch (WP 0089 00). 2. Check continuity of new switch before installation. 3. Reinstall lead 74A in pin B and lead 74 in pin A. 4. Turn start switch. Starter should turn engine. 1. If battery voltage is not present, go to test step 2. 2. If battery voltage is present, go to test step 3. 1. If continuity is not present, repair or replace leads 10 and 11 (WP 0090 00). 2. If continuity is present, reconnect leads 10 and 11, and battery ground cable (WP 0126 00). Go to test step 3. TM 9-2320-361-24-1 0012 00 0012 00-12 BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd) Table 2. Starting System Troubleshooting Procedure (Contd).