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 889 of 1313
ALL GAUGES INOPERATIVE - Continued
STEP
3.
IS THERE BATTERY VOLTAGE AT CIRCUIT 27 POWER WIRE?
a.
Check for battery voltage at instrument cluster circuit 27 power 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.
T0083DAA
27
To Circuit Breaker
Circuit 27 Power Wire
27
27
27
27
Figure 3.
Circuit 27 Wire Test.
e.
Disconnect instrument cluster wire assembly from circuit 27 power wire.
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 POWER WIRE?
DECISION
YES - Notify supervisor. Action may not be possible at this level of maintenance.
NO - Replace front wiring harness M939/A1 (Volume 3, WP
0357), M939A2 (Volume 3, WP
0358). Go to
Step
(4) to verify problem is solved.
TM 9-2320-272-23-1
0104
0104-4
Back to Top
