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 789 of 1313
NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR) - Continued
STEP
11.
IS THERE CONTINUITY BETWEEN PIN F OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD 568?
a.
Connect multimeter red lead to pin F at voltage regulator harness connector. Refer to point to point
schematics.
T0175DAA
566
566
ALTERNATOR
HARNESS
CONNECTOR
STARTER
MOTOR
GND
81
VOLTAGE
REGULATOR
HARNESS
CONNECTOR
568
568
VOM
Figure 11.
Voltage Regulator Harness.
b.
Connect multimeter black lead to lead 568.
c.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PIN F OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD 568?
DECISION
NO - Replace voltage regulator harness (Volume 5, WP
0792). Go to Step (12) to verify problem is solved.
YES - Notify supervisor. Action may not be possible at this level of maintenance.
TM 9-2320-272-23-1
0090
0090-12
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