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 914 of 1313
BATTERY/ALTERNATOR GAUGE INOPERATIVE - Continued
T0096DAA
27
40
40
40
27
33
40
Figure 2.
Battery-Alternator Gauge Test.
d.
Disconnect circuit 27 wire from inoperative battery-alternator gauge.
e.
Place battery switch to ON position.
f.
Set multimeter to measure VDC.
g.
Connect multimeter red lead to disconnected circuit 27 wire.
h.
Connect multimeter black lead to vehicle chassis ground.
i.
Meter reading should be greater than or equal to 18 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT CIRCUIT 27 WIRE?
DECISION
YES - Replace defective gauge (Volume 2, WP
0312). Go to Step (3) to verify problem is solved.
NO - Replace instrument cluster wiring harness (Volume 3, WP
0351). Go to Step (3) to verify problem is solved.
TM 9-2320-272-23-1
0108
0108-3
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