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
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