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BLACKOUT TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550305
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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BLACKOUT STOPLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550307
TM 9-2330-385-14
4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
18. BLACKOUT STOPLIGHT(S) 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)
24 vdc cable assembly connected to truck,
Personnel Required
Two
Parking brake applied, (TM 9-2320-364-10)
Truck air pressure charged, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
NOTE
The following troubleshooting procedures cover the left blackout stoplight, but they apply to both blackout stoplights.
D
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in Figure FO-1.1.
D
START
1.
KNOWN INFO
TEST OPTIONS
Truck electrical system OK.
Visual inspection.
Does at least one blackout
All other trailer lights operate.
stoplight operate when
Taillights operate indicating
REASON FOR QUESTION
brakes are applied?
LED composite light ground
If no blackout stoplights operate,
(wire 1435) OK.
fault is 24 vdc cable assembly
POSSIBLE PROBLEMS
through wire 1678C. If at least
one stoplight operates, fault is
rear junction box through LED
Wire 1678C/23 faulty.
composite light.
Wire 1678C faulty.
LED composite light faulty.
Go to Step 3 of this
NO
Fault.
YES

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