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 781 of 1313
NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR) - Continued
STEP
3.
IS THERE CONTINUITY BETWEEN PIN F OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD 566 OF THE VOLTAGE REGULATOR HARNESS?
a.
Stop engine.
b.
Disconnect quick disconnect for lead 566.
c.
Disconnect voltage regulator harness connector at alternator and voltage regulator.
d.
Set up multimeter to measure resistance.
T0167DAA
566
566
ALTERNATOR
HARNESS
CONNECTOR
VOLTAGE
REGULATOR
HARNESS
CONNECTOR
568
568
VOM
Figure 3.
Voltage Regulator Harness.
e.
Connect multimeter red lead to contact end of lead 566. Refer to point to point schematics.
f.
Connect multimeter black lead to pin F of the voltage regulator harness connector.
g.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PIN F OF THE VOLTAGE REGULATOR HARNESS CONNECTOR AND
LEAD 566 OF THE VOLTAGE REGULATOR HARNESS?
DECISION
NO - Replace voltage regulator harness (Volume 5, WP
0792). Go to Step (12) to verify problem is solved.
YES - Go to Step (4).
TM 9-2320-272-23-1
0090
0090-4
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