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 816 of 1313
BLACKOUT DRIVE OR BLACKOUT MARKER LIGHT INOPERATIVE - Continued
STEP
7.
IS MAIN LIGHT SWITCH OPERATING PROPERLY?
a.
Place battery switch to OFF position.
L
K
H
C
M
T0759DAA
B
A
N
E
F
Figure 7.
Main Lighting Switch Connector.
b.
Connect jumper cable from socket pin F to socket pin D. Refer to point to point schematics.
c.
Place battery switch to ON position.
NOTE
If non-operating blackout drive light illuminates, lighting switch is not operating properly.
d.
Look for lighted B.O. driving light.
e.
Connect jumper cable from socket pin F to socket pin E.
NOTE
If non-operating blackout lights illuminates, lighting switch is not operating properly.
f.
Look for lighted front and rear B.O. lights.
CONDITION/INDICATION
IS MAIN LIGHT SWITCH OPERATING PROPERLY?
DECISION
NO - Replace defective main light switch (Volume 2, WP
0315). Go to Step (8) to verify problem is solved.
YES - Repair or replace wiring from main light switch to non-operating lamp (Volume 3, WP
0352). Go to
Step
(8) to verify problem is solved.
TM 9-2320-272-23-1
0094
0094-7
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