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ALL LIGHTS ON REAR OF TRAILER DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550473
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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TAILLIGHTS AND STOPLIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550475
TM 9-2330-385-14
4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
17. TAILLIGHTS AND STOPLIGHTS DO NOT OPERATE (S/N YB6122 075 AND UP).
INITIAL SETUP
Tools and Special Tools
References
Tool Kit, General Mechanic's: Automotive
TM 9-2320-364-10
(Item 50, Appendix J)
Equipment Condition
Multimeter (Item 28, Appendix J)
Engine OFF, (TM 9-2320-364-10)
12 vdc cable assembly connected to truck,
Personnel Required
Two
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
NOTE
The following troubleshooting procedures cover the left taillight and stoplight, but they apply to right side taillight and
D
stoplight also.
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.1.
D
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
All other trailer lights operate.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Is continuity measured be-
If continuity is not measured
tween wire 1435 at LED
Wire 1435 faulty.
between wire 1435 wire and a
composite light and a known
LED composite light faulty.
known good ground, LED
good ground?
composite light ground (wire
1435) is faulty. If continuity is
measured, LED composite light
is faulty and lights will not
operate.
Repair wire 1435
(see schematic, Fig
FO-1.1) or replace rear
NO
side marker light
harness (Para 4-30).
Verify repair, go to
Step 2 of this Fault.
YES
Replace LED
composite light
Verify repair, go to
Step 2 of this
Fault.

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