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 793 of 1313
ALTERNATOR OVERCHARGING, BATTERY INDICATOR GAUGE IN RED POSITION - Continued
STEP
1.
IS THE ALTERNATOR OUTPUT VOLTAGE EXCESSIVE?
a.
Verify engine is stopped.
b.
Set up multimeter to measure VDC.
VEHICLE DIAGNOSTIC
CONNECTOR
ABS DIAGNOSTIC CONNECTOR
T0994DAA
Figure 1.
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 less than 29.5 VDC.
CONDITION/INDICATION
IS THE ALTERNATOR OUTPUT VOLTAGE EXCESSIVE?
DECISION
NO - Go to Step (3).
YES - Go to Step (2).
TM 9-2320-272-23-1
0091
0091-2
Back to Top
