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Page Title: BLACKOUT STOPLIGHT(S) DO NOT OPERATE. (Cont)
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TM 9-2330-385-14
7. BLACKOUT STOPLIGHT(S) DO NOT OPERATE (CONT).
5.
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 on
is OK
wire 1678/23-28 at blackout
Blackout stoplight lamp OK.
If 22 to 28 vdc are not present
Blackout stoplight OK.
on wire 1678/23-28, blackout
taillight connector?
24 vdc cable OK.
stoplight will not operate.
Connector MC15 OK.
Front junction box OK.
Wire 1678C-18 OK.
Rear junction box OK.
Repair wire
LED composite light OK.
1678/23-28 (see
Ground wire 1435 OK.
schematic, Fig FO-1)
or replace composite
POSSIBLE PROBLEMS
NO
light harness
Wire 1678/23-28 faulty.
Verify repair, go to
Step 10 of this Fault.
YES
If composite lights
are installed, fault not
corrected. Notify
supervisor.
Replace LED composite
light (para 4-29). Verify
repair, go to Step 10 of
this Fault.
4-90

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