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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).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-88.1
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 1678C-18 OK.
center contact of blackout
center contact of blackout light
Rear junction box OK.
stoplight socket?
socket, light will not operate.
POSSIBLE PROBLEMS
Blackout stoplight faulty.
Blackout stoplight lamp faulty.
Wire 1678/23-28 faulty.
Go to Step 4 of this
NO
Fault.
YES
3.
KNOWN INFO
WARNING
TEST OPTIONS
Read WARNING
Truck electrical system OK.
on Page 4-88.1
Continuity test.
All other trailer lights operate.
24 vdc cable OK.
Connector MC15 OK.
REASON FOR QUESTION
Is continuity measured
Front junction box OK.
Wire 1678C-18 OK.
If blackout stoplight ground is
between blackout stoplight
Rear junction box OK.
faulty, light will not operate.
socket ground and a known
Wire 1678/23-28 OK.
good ground?
POSSIBLE PROBLEMS
Blackout stoplight faulty.
Blackout stoplight lamp faulty.
Replace rear
composite light
NO
Verify repair, go to
Step 10 of this Fault.
YES
Replace blackout
stoplight lamp
Verify repair, go to
Step 10 of this Fault.
4-88
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