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 I
J
1. Reconnect powerplant wiring harness to
rectifier.
.
2. Disconnect rectifier-to-voltage regulator
wiring harness from rectifier.
3. Place jumper wires from pin E (lead 3) to a
battery negative terminal and pin B (lead 1 ) to
positive terminal of same battery
to apply 12 Vdc to alternator field.
4. Turn MASTER switch ON and run vehicle
engine at 1000 rpm.
5. Set multimeter on dc scale and place red lead
of multimeter on pin C (lead 2A) and black
lead to ground.
6. Check for voltage.
7. Turn MASTER switch and engine OFF.
Is voltage above 27.5 Vdc?
Replace rectifier (para 8-5)
‘CONTINUED ON NEXT PAGE
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