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 787 of 1313
NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR) - Continued
STEP
9.
IS THERE CONTINUITY BETWEEN PIN A OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD 81 AT STARTER SOLENOID?
a.
Connect multimeter red lead to pin A at voltage regulator harness connector. Refer to point to point
schematics.
T0173DAA
566
566
ALTERNATOR
HARNESS
CONNECTOR
STARTER
MOTOR
GND
81
VOLTAGE
REGULATOR
HARNESS
CONNECTOR
568
568
VOM
Figure 9.
Voltage Regulator Harness.
b.
Connect multimeter black lead to end of lead 81 at starter solenoid.
c.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PIN A OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD 81 AT STARTER SOLENOID?
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
0090-10
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