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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
14. TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP) (CONT).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
All other lights on trailer
operate.
REASON FOR QUESTION
Wire 1008B/21 OK.
Are 10 to 14 vdc measured
LED composite light OK.
If 10 to 14 vdc are not present
between terminals F and A
LED composite light ground
at 12 vdc cable, between
(wire 1435) OK.
on trailer end of 12 vdc
terminals F and A, taillights will
cable?
not operate.
POSSIBLE PROBLEMS
12 vdc cable faulty.
Wire 1008B faulty.
Wire 1008-1 faulty.
Repair (Para 4-31) or
Diode assembly faulty.
replace12 volt cable
NO
(Para 2-9) . Verify
repair, go to Step 7
of this Fault.
YES
5.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
All other lights on trailer
operate.
REASON FOR QUESTION
LED composite light ground
(wire 1435) OK.
Are 10 to 14 vdc measured on
If there are not 10 to 14 vdc
LED composite light OK.
wire 1008-1 at diode assembly
present at diode assembly con-
12 vdc cable OK.
connector terminal 8?
nector terminal 8, taillight will
Wire 1008B/21 OK.
not operate.
POSSIBLE PROBLEMS
Wire 1008B-20 faulty.
Repair wire 1008-1
Wire 1008-1 faulty.
(see schematic, Fig
Diode assembly faulty.
FO-1.1) or replace
NO
trailer main wire
Verify repair, go to
Step 7 of this Fault.
YES
4-202.26

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