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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).
6.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-81
All other trailer lights operate.
Blackout taillight lamp OK.
REASON FOR QUESTION
Blackout taillight OK.
LED composite light OK.
Are 22 to 28 vdc measured at
If 22 to 28 vdc are not present at
Taillights operate indicating
24 vdc cable, terminal A, light
terminal A and D on trailer
LED composite light ground
will not operate.
end of 24 vdc cable?
is OK.
Wire 1680/24-27 OK.
POSSIBLE PROBLEMS
24 vdc cable faulty.
Connector MC15 faulty.
Front junction box faulty.
Replace 24 vdc cable.
Wire 1680C-19 faulty.
NO
Verify repair, go to
Rear junction box faulty.
Step 10 of this Fault.
YES
7.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-81
All other trailer lights operate.
Taillights operate indicating
REASON FOR QUESTION
LED composite light ground
is OK.
Are 22 to 28 vdc present on
If there are not 22 to 28 vdc
Blackout taillight lamp OK.
wire 1680C-9 at front junction
present at front junction box
Blackout taillight OK.
box, terminal 9?
terminal 9, blackout taillight will
LED composite light OK.
not operate.
Wire 1680/24-27 OK.
24 vdc cable OK.
POSSIBLE PROBLEMS
Replace connector
Connector MC15 faulty.
MC15 (Para 4-30).
NO
Front junction box faulty.
Verify repair, go to
Wire 1680C-19 faulty.
Step 10 of this Fault.
Rear junction box faulty.
YES
4-80
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