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 887 of 1313
ALL GAUGES INOPERATIVE - Continued
STEP
1.
IS INSTRUMENT CLUSTER CIRCUIT BREAKER BATTERY VOLTAGE FEED CORRECT?
a.
Place battery switch to the OFF position.
b.
Check instrument cluster voltage feed.
c.
Refer to point to point schematics.
T0082DAA
Figure 1.
Circuit Breaker.
d.
Disconnect circuit 5A wire at circuit breaker.
e.
Set multimeter to measure VDC.
f.
Place battery switch to ON position.
g.
Connect multimeter red lead to disconnected circuit 5A 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 INSTRUMENT CLUSTER CIRCUIT BREAKER BATTERY VOLTAGE FEED CORRECT?
DECISION
YES - Go to Step (2).
NO - Repair or replace circuit 5A wire (Volume 3, WP
0352). Go to Step (4) to verify problem is solved.
STEP
2.
IS CIRCUIT BREAKER IN GOOD OPERATING CONDITION?
a.
Check for battery voltage at circuit breaker terminal.
b.
Place battery switch to the OFF position.
TM 9-2320-272-23-1
0104
0104-2
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