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Page Title: TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont)
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TM 9-2330-385-14
15. TAILLIGHT DOES NOT OPERATE (S/N YB6122 075 AND UP) (CONT).
2.
KNOWN INFO
WARNING
TEST OPTIONS
Read WARNING
Truck electrical system OK.
on Page 118.23
Voltage test.
All other lights on trailer
operate.
Wire 1435 OK.
REASON FOR QUESTION
Are 22 to 28 vdc measured on
If 22 to 28 vdc are present on
wire 1008B/21 at LED com-
wire 1008B/21, LED composite
posite light?
light is faulty.
POSSIBLE PROBLEMS
LED composite light faulty.
Wire 1008B/21 faulty.
Wire 1008B faulty.
Go to Step 3 of this
NO
Wire 1008C faulty.
Fault.
Diode assembly faulty.
YES
Replace LED com-
posite light (Para
4-29). Verify repair,
go to Step 6 of this
Fault.
4-118.22

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