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 909 of 1313
FUEL GAUGE INOPERATIVE - Continued
STEP
4.
IS THERE BATTERY VOLTAGE AT CIRCUIT 27 WIRE?
a.
Check for battery voltage at circuit 27 wire.
b.
Place battery switch to the OFF position.
c.
Remove instrument cluster panel (Volume 2, WP
0310).
d.
Refer to point to point schematics.
T0092DAA
Test Point
27
27
27
27
27
Figure 4.
Fuel Gauge Test.
e.
Disconnect circuit 27 wire from inoperative fuel gauge.
f.
Place battery switch to ON position.
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 - Go to Step (5).
NO - Replace instrument cluster wiring harness (Volume 3, WP
0351). Go to Step (6) to verify problem is solved.
STEP
5.
IS THERE VOLTAGE AT FUEL GAUGE?
a.
Check for 5 to 8 VDC at fuel gauge.
TM 9-2320-272-23-1
0107
0107-6
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