TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED m. ALTERNATOR CIRCUIT (M109A2/M109A3) — ALTERNATOR FAILS TO CHARGE BATTERIES; GAGE CONTINUED INDICATION: NOT CHARGING, UNSTEADY OR INACCURATE READING INITIAL SETUP Configurations . References M109A2/M109A3 TM 9-2350-311-10 TM 9-6140-200-14 TOoIS General mechanic’s tool kit (item 64, Appx H) . Equipment Conditions Multimeters (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 9-2350-311-1 0) 16 AWG wire may be used as an extension.) CAUTION I 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. NOTE Vehicle idle speed must be 750 rpm in order for alternator to charge properly. Check idle speed before troubleshooting (TM 9-2350-311-10). 1. Run engine at 1000 rpm. 2. Place red lead of multimeters on battery positive terminal and black lead to ground. 3. Check for voltage. 4. Turn engine off. Is voltage 27.5 Vdc or higher? I CONTINUED ON NEXT PAGE 3-156