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TM 9-2330-385-14
4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
5. STOPLIGHT DOES 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)
Truck air pressure charged, (TM 9-2320-364-10)
Materials/Parts
Locknut (Item 31, Appendix I)
24 vdc cable assembly connected to truck,
Packing, Preformed (Item 59, Appendix I)
Wheels chocked, (TM 9-2320-364-10)
Personnel Required
Parking brake applied, (TM 9-2320-364-10)
Two
NOTE
The following troubleshooting procedures cover the left stoplight, but they apply to both stoplights.
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
If LED composite light is installed, go to Step 4.1 of this Fault.
D
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
All other lights on trailer
operate.
REASON FOR QUESTION
Is continuity measured across
POSSIBLE PROBLEMS
If light lamp filament is faulty,
light lamp?
lamp will not operate.
Stoplight lamp faulty.
Stoplight faulty.
24 vdc cable faulty.
Connector MC15 faulty.
Front junction box faulty.
Wire 1003-17 faulty.
Rear junction box faulty.
Wire 1004/22-30 faulty.
Replace stoplight
NO
Verify repair, go to
Step 10 of this Fault.
YES

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