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Page Title: STOPLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP).
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TM 9-2330-385-14
4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
15. 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)
Wheels chocked, (TM 9-2320-364-10)
12 vdc cable assembly connected to
Personnel Required
truck, (TM 9-2320-364-10)
Two
Parking brake applied, (TM 9-2320-364-10)
Truck air pressure charged
(TM 9-2320-364-10)
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-1.1.
D
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Voltage test.
Truck electrical system OK.
All other lights on trailer
operate.
REASON FOR QUESTION
Taillight operates indicating
Are 10 to 14 vdc measured
LED composite light ground
If 10 to 14 vdc are present on
on wire 1003C/22 at LED
(wire 1435) OK.
wire 1003C/22, LED composite
composite light?
light is faulty.
POSSIBLE PROBLEMS
12 vdc cable faulty.
Wire 1003C faulty.
Wire 1003C/22 faulty.
Wire 1003-5 faulty.
Diode assembly faulty.
Go to Step 2 of this
NO
LED composite light faulty.
Fault.
YES
Replace LED
composite light
repair, go to Step 6 of
this Fault.

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