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 944 of 1313
SPRING BRAKE WARNING LIGHT INOPERATIVE WITH SPRING BRAKE OVERRIDE ENGAGED - Continued
T0111DAA
Figure 2.
Spring Brake Pressure Switch Wire 37.
c.
Connect a jumper wire from one circuit 37 wire to another. Refer to point to point schematic.
d.
Place battery switch to ON position.
NOTE
If spring brake override lamp operates, spring brake pressure switch is faulty.
e.
Check if spring brake override lamp operates.
CONDITION/INDICATION
DOES SPRING BRAKE PRESSURE SWITCH OPERATE PROPERLY?
DECISION
NO - Replace defective spring brake pressure switch (Volume 2, WP
0308). Go to Step (5) to verify problem is
solved.
YES - Go to Step (3).
TM 9-2320-272-23-1
0112
0112-3
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