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 668 of 1313
RADIO INTERFERENCE - Continued
STEP
2.
IS ALTERNATOR IN GOOD OPERATING CONDITION?
NOTE
Prevent open wires from touching each other, or any metal part.
a.
Disconnect harness connector from alternator. Refer to point to point schematics.
(1)
M939/A1 60 amp alternator (Volume 2, WP
0300).
(2)
M939A2 60 amp alternator (Volume 2, WP
0301).
(3)
100 amp alternator (Volume 5, WP
0780).
T0641DAA
ALTERNATOR/
ELECTRICAL
WIRING
RADIO
Figure 2.
Alternator.
b.
Start engine.
NOTE
If no interference is heard, alternator is faulty.
c.
Listen to radio for interference.
CONDITION/INDICATION
IS ALTERNATOR IN GOOD OPERATING CONDITION?
DECISION
YES - Notify supervisor. Action may not be possible at this level of maintenance.
NO - Replace faulty alternator M939/A1 60 amp (Volume 2, WP
0300),
M939A2 60 amp (Volume 2, WP
0301), 100 amp (Volume 5, WP
0780). Go to Step (3) to verify problem is
solved.
TM 9-2320-272-23-1
0070
0070-3
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