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STOPLIGHT DOES NOT OPERATE. (Cont) -725550213
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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BLACKOUT TAILLIGHT(S) DO NOT OPERATE. (Cont) -725550215
TM 9-2330-385-14
4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
6. BLACKOUT TAILLIGHT(S) DO NOT OPERATE.
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)
Materials/Parts
24 vdc cable assembly connected to truck,
Locknut (Item 31, Appendix I)
Packing, Preformed (Item 59, Appendix I)
Parking brake applied, (TM 9-2320-364-10)
Personnel Required
Two
NOTE
The following troubleshooting procedures cover the left blackout taillight, but they apply to both blackout taillights.
D
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
D
Trailer may be equipped with composite lights or LED composite lights.
D
START
1.
KNOWN INFO
TEST OPTIONS
Truck electrical system OK.
Visual inspection.
Does at least one blackout
All other trailer lights operate.
taillight operate when power
Taillights operate indicating
REASON FOR QUESTION
is applied?
LED composite light ground
is OK.
If no blackout taillights operate,
fault is in 24 vdc cable through
POSSIBLE PROBLEMS
wire 1680C-19. If at least one
blackout taillight operates, fault
is in rear junction box through
Blackout taillight faulty.
faulty lamp.
Blackout taillight lamp faulty.
Wire 1680/24-27 faulty.
24 vdc cable faulty.
Connector MC15 faulty.
Front junction box faulty.
Wire 1680C-19 faulty.
Go to Step 6 of this
NO
Rear junction box faulty.
Fault.
YES
If composite lights
are installed, go to
Step 2 of this Fault.
If LED composite
lights are insalled,
go to Step 5 of this
Fault.

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