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 A I NOTE For steps H, 1, J, and K use heavy jumper wires with alligator clips. I . . . . 3. 4. 5. 6. 7. 8. 9. Disconnect powerplant wiring harness from alternator. Place jumper wires from pin C (lead 3) of alternator to battery negative terminal and pin A (lead 1) of alternator to positive terminal of same battery to apply 12 Vdc to alternator field. Place a jumper wire from pin E to socket E (lead 503). Turn MASTER switch ON and run vehicle engine at 1000 rpm. Set multimeter on ac scale, and place red lead of multimeter on pin B (lead 500) and black lead on pin D (lead 501). Check for voltage. Place red lead of multimeter on pin F (lead 502) and black lead on pin B (lead 500). Check for voltage. Turn MASTER switch and engine OFF. Is voltage above 27.5 Vat? Replace alternator (para 8-2). CONTINUED ON NEXT PAGE 3-174