TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM 9-2350-311 -20-1 ALTERNATOR FAILS TO CHARGE BATTERIES; GAGE INDICATION: NOT CHARGING, UNSTEADY OR INACCURATE READING Applicable Configurations . . References M109A4/M109A5 TM 9-2350-311-10 TM 9-6140-200-14 General mechanic’s tool kit (item 64, Appx H) . . Equipment Condltions Multimeter (item 36, Appx H) Engine compartment access cover removed (para 11 -5) TA-1 probe kit (item 43, Appx H) Engine access door open (TM 9-2350-311-10) (Long test leads may be needed for some tests; Transmission access doors open (TM 9-2350-311-10) 16 AWG wire maybe used as an extension.) CAUTION Extremely low battery electrolyte levels will cause a low voltage indication on BATTERY indicator on portable instrument panel. Regulators can be damaged by attempts to adjust rheostat beyond its stops when the only problem is dry batteries. m NOTE Vehicle idle speed must be 750 rpm in order for alternator to charge property. Check idle speed before troubleshooting (TM 9-2350-311-10). I 1. Run engine at 1000 rpm. 2. Place red lead of multimeter on battery I positive terminal and black lead to ground. 3. Check for voltage. 4. Turn engine off. Is voltage 27.5 Vdc or higher? I Go to step H. CONTINUED ON NEXT PAGE 3-169