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 834 of 1313
TAIL AND MARKER LIGHTS INOPERATIVE - Continued
g.
Connect multimeter red lead to disconnected wire. Refer to point to point schematics.
h.
Connect multimeter black lead to good ground.
i.
Meter reading should be greater than 18 VDC for each reading.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT NON-OPERATING TAIL AND MARKER LAMP CONNECTOR?
DECISION
YES - Voltage at wire 21. Replace defective composite light (Volume 2, WP
0327). Go to Step (8) to verify
problem is solved.
YES - Voltage at wire 489. Replace defective marker light (Volume 2, WP
0330). 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
T0768DAA
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
0096
0096-5
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