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 827 of 1313
STOPLIGHT INOPERATIVE (SERVICE OR BLACKOUT) - Continued
STEP
10.
IS MAIN LIGHT SWITCH OPERATING PROPERLY?
a.
Place battery switch to OFF position.
L
K
H
C
M
T0763DAA
B
A
N
E
F
Figure 10.
Main Lighting Switch Connector.
b.
Connect jumper cable from socket pin F to socket pin C. Refer to point to point schematics.
NOTE
•
For stoplight circuit test, air pressure must be maintained at operating pressure and
brake pedal must be depressed.
•
If all service and blackout stoplights operate, main light switch is faulty.
c.
Start vehicle engine and depress brake pedal.
d.
Look for lighted service stoplights.
e.
Connect jumper cable from socket pin F to socket pin N.
f.
Look for lighted B.O stoplights.
CONDITION/INDICATION
IS MAIN LIGHT SWITCH OPERATING PROPERLY?
DECISION
NO - Replace defective main light switch (Volume 2, WP
0315). Go to Step (12) to verify problem is solved.
YES - Go to Step (11).
TM 9-2320-272-23-1
0095
0095-10
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