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 945 of 1313
SPRING BRAKE WARNING LIGHT INOPERATIVE WITH SPRING BRAKE OVERRIDE ENGAGED - Continued
STEP
3.
IS THERE BATTERY VOLTAGE AT SPRING BRAKE WARNING LIGHT CIRCUIT BREAKER?
a.
Place battery switch to OFF position.
b.
Disconnect circuit 10 wire at circuit breaker.
T0112DAA
10
37
Figure 3.
Spring Brake Override Warning Circuit Breaker Wire 10.
c.
Place battery switch to ON position.
d.
Set up multimeter to measure VDC.
e.
Connect multimeter red lead to circuit 10 wire as shown. Refer to point to point schematics.
f.
Connect multimeter black lead to vehicle chassis ground.
g.
Meter reading should be greater than 18 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT SPRING BRAKE WARNING LIGHT CIRCUIT BREAKER?
DECISION
NO - Notify supervisor. Action may not be possible at this level of maintenance.
YES - Go to Step (4).
STEP
4.
IS THERE BATTERY VOLTAGE AT CIRCUIT 37 TERMINAL OF CIRCUIT BREAKER?
a.
Place battery switch to OFF position.
TM 9-2320-272-23-1
0112
0112-4
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