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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).
6.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-93
Taillights operate indicating
LED composite light ground
REASON FOR QUESTION
is OK.
All other trailer lights operate.
Are 22 to 28 vdc measured at
If 22 to 28 vdc are not present
Blackout stoplight OK.
pin F and pin D on trailer end
at 24 vdc cable, terminal F,
Blackout stoplight lamp OK.
of 24 vdc cable?
stoplight will not operate.
Wire 1678/23-28 OK.
LED composite light OK.
Ground wire 1435 OK.
POSSIBLE PROBLEMS
24 vdc cable faulty.
Connector MC15 faulty.
Replace 24 vdc cable.
Front junction box faulty.
NO
Verify repair, go to
Wire 1678C-18 faulty.
Step 10 of this Fault.
Rear junction box faulty.
YES
7.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-93
All other trailer lights operate.
Taillights operate indicating
REASON FOR QUESTION
LED composite light ground
Are 22 to 28 vdc present on
is OK.
If there are not 22 to 28 vdc
wire 1678C-7 at front junction
Blackout stoplight OK.
present at front junction box,
Blackout stoplight lamp OK.
box, terminal 7?
terminal 7, blackout stoplight will
Wire 1678/23-28 OK.
not operate.
24 vdc cable OK.
LED composite light OK.
Ground wire 1435 OK.
POSSIBLE PROBLEMS
Replace connector
Connector MC15 faulty.
MC15 (Para 4-30).
NO
Front junction box faulty.
Verify repair, go to
Wire 1678C-18 faulty.
Step 10 of this Fault.
Rear junction box faulty.
YES
4-92
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