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 780 of 1313
NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR) - Continued
STEP
2.
IS THE ALTERNATOR OUTPUT VOLTAGE NORMAL?
a.
Verify engine is stopped.
b.
Set up multimeter to measure VDC.
VEHICLE DIAGNOSTIC
CONNECTOR
ABS DIAGNOSTIC CONNECTOR
T0994DAA
Figure 2.
DCA Connector.
c.
Connect multimeter red lead to vehicle DCA connector, terminal N. Refer to point to point schematics.
d.
Connect multimeter black lead to vehicle DCA connector, terminal P.
e.
Start engine and run at fast idle.
f.
Meter reading should be between 26.5 and 29.5 VDC.
CONDITION/INDICATION
IS THE ALTERNATOR OUTPUT VOLTAGE NORMAL?
DECISION
NO - Replace defective alternator (Volume 5, WP
0780). Go to Step (12) to verify problem is solved.
YES - Go to Step (3).
TM 9-2320-272-23-1
0090
0090-3
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