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 774 of 1313
NO OR LOW ALTERNATOR OUTPUT - Continued
STEP
6.
IS THERE BATTERY VOLTAGE AT WIRE 5 AT THE ALTERNATOR TERMINAL?
a.
Connect multimeter red lead to circuit 5 at the alternator terminal. Refer to point to point schematics.
T0936DAA
BLACK
RED
3 (NEG)
5 (POS)
568
Figure 6.
Alternator Wire 5.
b.
Connect multimeter black lead to vehicle ground.
c.
Meter reading should be between 22 and 26 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT WIRE 5 AT THE ALTERNATOR TERMINAL?
DECISION
NO - Go to Step (7).
YES - Repair wire 568 (Volume 3, WP
0352). Go to Step (8) to verify problem is solved.
TM 9-2320-272-23-1
0089
0089-7
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