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 814 of 1313
BLACKOUT DRIVE OR BLACKOUT MARKER LIGHT INOPERATIVE - Continued
DECISION
YES - Battery voltage at circuit 19 wire. Replace non-operating blackout drive light (Volume 2, WP
0326). Go
to Step (8) to verify problem is solved.
YES - Battery voltage at circuit 20 wire. Replace non-operating front composite light (Volume 2, WP
0327). Go
to Step (8) to verify problem is solved.
YES - Battery voltage at circuit 24 wire. Replace non-operating rear composite light (Volume 2, WP
0327). Go
to Step (8) to verify problem is solved.
NO - Go to Step (5).
STEP
5.
IS THERE BATTERY VOLTAGE AT MAIN LIGHT SWITCH HARNESS CONNECTOR?
a.
Place battery switch to OFF position.
L
K
H
C
M
T0759DAA
B
A
N
E
F
Figure 5.
Main Lighting Switch Connector.
b.
Remove lighting switch from instrument panel and disconnect harness
connector (Volume 2, WP
0315).
c.
Place battery switch to ON position.
d.
Connect multimeter red lead to connector socket pin F. Refer to point to point schematics.
e.
Connect multimeter black lead to good ground.
f.
Meter reading should be greater than 18 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT MAIN LIGHT SWITCH HARNESS CONNECTOR?
DECISION
NO - Go to Step (6).
YES - Go to Step (7).
TM 9-2320-272-23-1
0094
0094-5
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