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 n. ALTERNATOR CIRCUIT (M109A4/M109A5) — ALTERNATOR FAILS TO CHARGE BATTERIES; GAGE CONTINUED INDICATION: NOT CHARGING, UNSTEADY OR INACCURATE READING — CONTINUED CONTINUED FROM STEP K 1. Reconnect rectifier to voltage regulator wiring harness to voltage regulator. 2. Disconnect battery ground leads. 3. Disconnect engine disconnect bracket-to- bulkhead wiring harness from voltage regulator. 4. Place jumper wires from socket A (lead 2) to socket B (lead 400-459B) and from pin C (lead 3) to battery negative terminal and pin F (lead 27B) to the positive terminal of the same battery to apply 12 Vdc to alternator field. 5. Reconnect battery ground leads. 6. Turn MASTER switch ON and run vehicle engine at 1000 rpm (oil pressure at 12 psi [83 kPa]). 7. Place red lead of multimeter in socket F (lead 276) and black lead to ground. 8. Check for voltage. Is voltage above 27.5 Vdc? motor circuit (para 3-31). Troubleshoot air cleaner blower CONTINUED ON NEXT PAGE 3-178