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 769 of 1313
NO OR LOW ALTERNATOR OUTPUT - Continued
STEP
1.
DO THE ALTERNATOR DRIVE BELTS HAVE THE PROPER TENSION?
a.
Verify engine is stopped.
T0932DAA
ALTERNATOR
DRIVE BELT
Figure 1.
Alternator Drive Belt.
b.
Inspect alternator belts for damage and proper tension M939/A1 (Volume 2, WP
0297),
M939A2 (Volume 2, WP
0296).
CONDITION/INDICATION
DO THE ALTERNATOR DRIVE BELTS HAVE THE PROPER TENSION?
DECISION
NO - Adjust or replace alternator belt M939/A1 (Volume 2, WP
0297), M939A2 (Volume 2, WP
0296). Go to
Step (8) to verify problem is solved.
YES - Go to Step (2).
STEP
2.
IS THE ALTERNATOR OUTPUT VOLTAGE NORMAL?
a.
Verify engine is stopped.
b.
Set up multimeter to measure VDC.
TM 9-2320-272-23-1
0089
0089-2
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