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Page Title:
BLACKOUT TAILLIGHT(S) DO NOT OPERATE. (Cont) |
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 TM 9-2330-385-14
6. BLACKOUT TAILLIGHT(S) DO NOT OPERATE (CONT).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
on Page 4-79
All other trailer lights operate.
24 vdc cable OK.
REASON FOR QUESTION
Connector MC15 OK.
Front junction box OK.
Is continuity measured
If continuity is not measured on
Wire 1680C-19 OK.
between center contact of
center contact at connector,
Rear junction box OK.
voltage cannot be supplied to
blackout taillight socket and
light lamp.
connector?
POSSIBLE PROBLEMS
Blackout taillight faulty.
Blackout taillight lamp faulty.
Wire 1680/24-27 faulty.
Replace rear
composite light
NO
Verify repair, go to
Step 10 of this
Fault.
YES
Fault not corrected.
Notify DS
Maintenance.
5.
KNOWN INFO
WARNING
TEST OPTIONS
Read WARNING
Truck electrical system OK.
on Page 4-79
Voltage test.
All other trailer lights operate.
Taillights operate indicating
REASON FOR QUESTION
LED composite light ground
Are 22 to 28 vdc measured on
is OK.
If 22 to 28 vdc are not present
Blackout taillight lamp OK.
wire 1680/24-27 at blackout
on wire 1680/24-27, blackout
Blackout taillight OK.
taillight connector?
taillight will not operate.
24 vdc cable OK.
Connector MC15 OK.
Front junction box OK.
Wire 1680C-19 OK.
Rear junction box OK.
Repair wire
1680/24-27 (see
POSSIBLE PROBLEMS
schematic, Fig FO-1)
or replace side
LED composite light faulty.
NO
composite harness
Wire 1680/24-27 faulty.
Verify repair, go to
Step 10 of this Fault.
YES
If composite lights
are installed, fault not
corrected. Notify DS
Maintenance, or replace
LED composite
(Para 2-49). Verify
repair, go to Step 10 of
this Fault.
4-78
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