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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).
5.
KNOWN INFO
WARNING
TEST OPTIONS
Read WARNING
Truck electrical system OK.
Voltage test.
All other lights on trailer
operate.
REASON FOR QUESTION
Wire 1435 OK.
Are 22 to 28 vdc measured
LED composite light OK.
on wire 1008C at diode
If 22 to 28 vdc is not supplied to
Wire 1008B/21 OK.
diode assembly connector, ter-
Wire 1008B OK.
assembly connector terminal
minal 12, wire 1008C is faulty.
12?
If 22 to 28 vdc is supplied to
diode assembly connector,
POSSIBLE PROBLEMS
diode assembly is faulty.
Wire 1008C faulty.
Repair wire 1008C
Diode assembly faulty.
(see schematic Fig
FO-1.1) or replace
trailer main wire
NO
harness (Para
4-30.1). Verifty repair,
go to Step 6 of this
fault.
YES
Replace diode
assembly. Verify
repair, Go to Step 6 of
this fault.
4-118.28

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