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Page Title:
BLACKOUT STOPLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) |
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 TM 9-2330-385-14
18. BLACKOUT STOPLIGHT(S) DO NOT OPERATE
(S/N YB6122 075 AND UP) (CONT).
2.
KNOWN INFO
WARNING
TEST OPTIONS
Read WARNING
Truck electrical system OK.
Voltage test.
All other trailer lights operate.
Taillights operate indicating
LED composite light ground
REASON FOR QUESTION
Are 22 to 28 vdc measured
(wire 1435) OK
If 22 to 28 vdc are not present
on wire 1678C/23 at LED
24 vdc cable OK.
on wire 1678C/23, LED com-
Wire 1678C OK.
composite light?
posite light is faulty. If not,
composite light wire harness,
wire 1678C is fautly.
Repair wire
POSSIBLE PROBLEMS
1678C/23 (see
schematic, Fig
Wire 1678C/23 faulty.
FO-1.1) or replace
NO
LED composite light faulty.
composite light wire
harness (Para
4-30.1). Verify repair,
go to Step 4 of this
Fault.
YES
Replace LED
composite light
(para 4-29). Verify
repair, go to Step 4
of this Fault.
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
Taillights operate indicating
LED composite light ground
REASON FOR QUESTION
(wire 1435) OK.
All other trailer lights operate.
Are 22 to 28 vdc measured
If 22 to 28 vdc are not present
Wire 1678C/23 OK.
at 24 vdc cable, between ter-
between terminals F and D
LED composite light OK.
minals F and D, blackout
on trailer end of 24 vdc
stoplight will not operate.
cable?
POSSIBLE PROBLEMS
24 vdc cable faulty.
Repair/replace 24
Wire 1678C faulty.
vdc cable. Verify
NO
repair, go to Step 4
of this Fault.
YES
Repair wire 1678C
(see schematic, Fig
FO-1.1) or replace
trailer main wire
harness (Para 4-30.1).
Verify repair, go to
Step 4 of this Fault.
4-118.48
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