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 775 of 1313
NO OR LOW ALTERNATOR OUTPUT - Continued
STEP
7.
IS THERE CONTINUITY BETWEEN CIRCUIT 5 AND CIRCUIT 568?
a.
Disconnect battery negative cable (Volume 2, WP
0346).
b.
Set up multimeter to measure resistance.
T0938DAA
BLACK
RED
3 (NEG)
5 (POS)
568
Figure 7.
Alternator Wire 5/568.
c.
Connect multimeter red lead to circuit 568. Refer to point to point schematics.
d.
Connect multimeter black lead to circuit 5 at the alternator terminal.
e.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN CIRCUIT 5 AND CIRCUIT 568?
DECISION
NO - Repair wire 568 (Volume 3, WP
0352). Go to Step (8) to verify problem is solved.
YES - Notify supervisor. Action may not be possible at this level of maintenance.
TM 9-2320-272-23-1
0089
0089-8
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