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 910 of 1313
FUEL GAUGE INOPERATIVE - Continued
b.
Place battery switch to the OFF position.
c.
Refer to point to point schematics.
d.
Reconnect circuit 27 wire to fuel gauge.
T0093DAA
27
Test Point
27
27
27
27
Figure 5.
Fuel Gauge Test.
NOTE
Trucks with right hand only tanks will disconnect circuit 29 wire from fuel gauge.
e.
Disconnect circuit 28 wire from fuel gauge.
f.
Place battery switch to ON position.
g.
Connect multimeter red lead to open terminal on fuel gauge.
h.
Connect multimeter black lead to vehicle chassis ground.
NOTE
If 5 to 8 VDC is not present at fuel gauge, fuel gauge is faulty.
i.
Meter reading should be between 5 and 8 VDC.
CONDITION/INDICATION
IS THERE VOLTAGE AT FUEL GAUGE?
DECISION
NO - Replace defective gauge (Volume 2, WP
0312). Go to Step (6) to verify problem is solved.
YES - Repair or replace circuit 28 wire from gauge to selector switch (Volume 3, WP
0352). Go to Step (6) to
verify problem is solved.
TM 9-2320-272-23-1
0107
0107-7
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