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 951 of 1313
ONE OR MORE TRAILER LIGHTS INOPERATIVE - Continued
STEP
3.
IS TRAILER RECEPTACLE PROPERLY GROUNDED?
a.
Place battery switch to OFF position.
T0122DAA
A
L
J
K
N
M
B
C
D
E
F
Figure 3.
Trailer Receptacle.
b.
Set up multimeter to measure resistance.
c.
Connect multimeter red lead to circuit 90 wire at socket (receptacle terminal L and then D). Refer to point
to point schematics.
d.
Connect multimeter black lead to good ground.
e.
Meter reading should be less than 200 ohms for both measurements.
CONDITION/INDICATION
IS TRAILER RECEPTACLE PROPERLY GROUNDED?
DECISION
NO - Repair broken circuit 90 wire (Volume 3, WP
0352). Go to Step (7) to verify problem is solved.
YES - Go to Step (4).
TM 9-2320-272-23-1
0113
0113-4
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