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 — CONTINUED CONTINUED FROM STEP H 1. Reconnect powerplant wiring harness to alternator. 2. Disconnect powerplant wiring harness from rectifier. 3. Place jumper wires from pin E (lead 3) to battery negative terminal and pin D (lead 1) to the positive terminal of the same battery to apply 12 Vdc to the alternator field. 4. Turn MASTER switch ON and run vehicle engine at idle speed (750 rpm). 5. Set multimeters on ac scale, and place red lead of multimeter on pin A (lead 500) and black lead on pin B (lead 501). 6. Check for voltage. 7. Place red lead of multimeters on pin C (lead 502) and black lead on pin A (lead 500). 8. Check for voltage. 9. Turn MASTER switch and engine OFF. Is voltage above 27.5 Vat? I I Repair or replace leads 500,501, and/or 502 of powerplant wiring harness (para 8-43). CONTINUED ON NEXT PAGE 3-162