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 826 of 1313
STOPLIGHT INOPERATIVE (SERVICE OR BLACKOUT) - Continued
STEP
9.
IS THERE CONTINUITY ACROSS CIRCUIT WIRE 75?
a.
Place battery switch to OFF position.
b.
Disconnect circuit 75 wire at stoplight switch.
c.
Remove lighting switch from instrument panel and disconnect harness
connector (Volume 2, WP
0315).
d.
Setup multimeter to measure ohms.
L
K
H
C
M
T0763DAA
B
A
N
E
F
Figure 9.
Main Lighting Switch Connector.
e.
Connect jumper cable between lighting system harness connector socket pins A and K. Refer to point
to point schematic.
f.
Connect multimeter red lead to circuit wire 75 at stop switch.
g.
Connect multimeter black lead to other circuit wire 75 at stop switch.
h.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY ACROSS CIRCUIT WIRE 75?
DECISION
NO - Repair or replace broken circuit wire 75 (Volume 3, WP
0352). Go to Step (12) to verify problem is solved.
YES - Go to Step (10).
TM 9-2320-272-23-1
0095
0095-9
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