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 946 of 1313
SPRING BRAKE WARNING LIGHT INOPERATIVE WITH SPRING BRAKE OVERRIDE ENGAGED - Continued
b.
Reconnect circuit 10 wire.
T0113DAA
10
37
Figure 4.
Spring Brake Override Warning Circuit Breaker Wire 37.
c.
Disconnect circuit 37 wire from circuit breaker.
d.
Place battery switch to ON position.
e.
Connect multimeter red lead to circuit 37 terminal at circuit breaker 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 CIRCUIT 37 TERMINAL OF CIRCUIT BREAKER?
DECISION
NO - Replace defective circuit breaker (Volume 2, WP
0307). Go to Step (5) to verify problem is solved.
YES - Repair or replace circuit 37 wire from circuit breaker to brake pressure switch (Volume 3, WP
0352). Go
to Step (5) to verify problem is solved.
TM 9-2320-272-23-1
0112
0112-5
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