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 772 of 1313
NO OR LOW ALTERNATOR OUTPUT - Continued
STEP
4.
IS THERE BATTERY VOLTAGE AT WIRE 568 AT THE ALTERNATOR?
a.
Stop engine.
b.
Disconnect wire 568 from the alternator.
T0937DAA
BLACK
RED
3 (NEG)
5 (POS)
568
Figure 4.
Alternator Wire 568.
c.
Place battery switch to ON position.
d.
Connect multimeter red lead to lead 568. Refer to point to point schematics.
e.
Connect multimeter black lead to vehicle ground.
f.
Meter reading should be between 22 and 26 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT WIRE 568 AT THE ALTERNATOR?
DECISION
NO - Go to Step (6).
YES - Go to Step (5).
TM 9-2320-272-23-1
0089
0089-5
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