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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).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-77
All other trailer lights operate.
24 vdc cable OK.
REASON FOR QUESTION
Connector MC15 OK.
Front junction box OK.
Are 22 to 28 vdc present on
If 22 to 28 vdc is not present on
Wire 1680C-19 OK.
center contact of blackout
center contact of blackout light
Rear junction box OK.
socket, light will not operate.
taillight socket?
POSSIBLE PROBLEMS
Blackout taillight faulty.
Blackout taillight lamp faulty.
Wire 1680/24-27 faulty.
Go to Step 4 of this
NO
Fault.
YES
3.
KNOWN INFO
WARNING
TEST OPTIONS
Read WARNING
Truck electrical system OK.
on Page 4-77
Continuity test.
All other trailer lights operate.
Wire 1680/24-27 OK.
24 vdc cable OK.
REASON FOR QUESTION
Connector MC15 OK.
Is continuity measured
Front junction box OK.
If blackout taillight ground is
between blackout taillight
Wire 1680C-19 OK.
faulty, corroded, or loose, light
socket ground to a known
Rear junction box OK.
will not operate.
good ground?
POSSIBLE PROBLEMS
Blackout taillight faulty.
Blackout taillight lamp faulty.
Replace rear
composite light
NO
Verify repair, go to
Step 10 of this
Fault.
YES
Replace blackout
taillight lamp
Verify repair, go to
Step 10 of this Fault.
4-76
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