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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).
8.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-95
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 at
front junction box at
Blackout stoplight OK.
front junction box terminal 18,
terminal 18?
Blackout stoplight lamp OK.
blackout taillight will not operate.
Wire 1678/23-28 OK.
24 vdc cable OK.
Connector MC15 OK.
LED composite light OK.
Ground wire 1435 OK.
Replace front junction
POSSIBLE PROBLEMS
box (Para 4-25).
NO
Front junction box faulty.
Verify repair, go to
Wire 1678C-18 faulty.
Step 10 of this Fault.
Rear junction box faulty.
YES
4-94
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