TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

  TM-9-2350-311-20-1 - Page 262 of 1275

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


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