TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 788 of 1313
NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR) - Continued
STEP
10.
IS THERE CONTINUITY BETWEEN PIN C OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD AT STARTER MOTOR?
a.
Connect multimeter red lead to pin C at voltage regulator harness connector. Refer to point to point
schematics.
T0174DAA
566
566
ALTERNATOR
HARNESS
CONNECTOR
STARTER
MOTOR
GND
81
VOLTAGE
REGULATOR
HARNESS
CONNECTOR
568
568
VOM
Figure 10.
Voltage Regulator Harness.
b.
Connect multimeter black lead to end of lead to the ground connector at starter motor.
c.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PIN C OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD AT STARTER MOTOR?
DECISION
NO - Replace voltage regulator harness (Volume 5, WP
0792). Go to Step (12) to verify problem is solved.
YES - Go to Step (10).
TM 9-2320-272-23-1
0090
0090-11
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