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Page Title:
STOPLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) |
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 TM 9-2330-385-14
16. STOPLIGHT DOES NOT OPERATE (S/N YB6122 075 AND UP) (CONT).
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
All other lights on trailer
operate.
REASON FOR QUESTION
Taillights operate indicating
Are 22 to 28 vdc measured
LED composite light ground
If 22 to 28 vdc are measured at
at rear junction box terminal
(wire 1435) OK.
rear junction box, terminal wire
LED composite light OK.
wire 1003C?
1003C, trailer main wire
24 vdc cable OK.
harness wire 1003C is faulty, if
notcomposite light harness wire
1003C/22 is faulty.
POSSIBLE PROBLEMS
Repair wire 1003C
(see schematic, Fig
Wire 1003C faulty.
FO-1.1) or replace
Wire 1003C/22 faulty.
trailer main wire
NO
harness (Para
4-30.1). Verify repair,
go to Step 4 of this
Fault.
YES
Repair wire
1003C/22 (see sche-
matic Fig FO-1.1) or
replace composite
light wire
harness (Para
4-30.1). Verify
repair, go to Step 4
of this fault.
4-118.36
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