Quantcast 52.  24 VOLT SYSTEM NOT CHARGING OR UNDER CHARGING (145 AMP).

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VERIFY REPAIR - TM-9-2320-364-20-2_855
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TM-9-2320-364-20-2 Truck Tractor Line Haul 52 000 GVWR 6x4 M915A2 Truck Tractor Light Equipment Transporter (Let) Manual
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VOLTAGE TEST - TM-9-2320-364-20-2_857
TM 9-2320-364-20-2 2-1632 52.  24 VOLT SYSTEM NOT CHARGING OR UNDER CHARGING (145 AMP). INITIAL SETUP 1. Replace voltage regulator (Para 7-6). Verify repair, go to Step 6 of this Fault. START YES NO 24 vdc voltmeter indicates low   charge. 12 vdc voltmeter indicates   proper charge. Batteries OK. Fuel pump operates indicating   24 vdc present at DUVAC   controller IGN terminal. Windshield wipers operate   indicating wires 1281 and   1277 and magnetic switch   R26 are OK. Voltage regulator faulty (Timer   Section). Wire 1702 faulty. Wire 1435 faulty. 24 vdc voltmeter faulty. DUVAC controller out of   adjustment. DUVAC controller faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If voltage regulator does not shut down the charging system for 1-2 seconds every 55-60 seconds, charging system will not reset to the 24 vdc mode and 24 vdc system will under- charge. 2-20.  ELECTRICAL SYSTEM TROUBLESHOOTING (CONT.) Tools and Special Tools Tool  Kit,  General  Mechanic’s:  Automotive (Item 74, Appendix G) STE/ICE-R (optional) (Item 3, Appendix G) Multimeter (2) (Item 44, Appendix G) Equipment Condition Engine OFF, (TM 9-2320-364-10) Parking brake applied, (TM 9-2320-364-10) Wheels chocked, (TM 9-2320-364-10) References TM 9-2320-364-10 TM 9-4910-571-12&P Materials/Parts Lockwasher (4) (Item 171, Appendix F) Does voltage regulator shut down the charging system for 1-2 seconds every 55-60 seconds? WARNING Read   WARNING on Page 2-1633

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