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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).
9.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-97
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
Blackout stoplight OK.
wire 1678C-18 at rear junction
rear junction box, terminal 18,
Blackout stoplight lamp OK.
box, terminal 18?
wire 1678C-18 is faulty. If 22 to
Wire 1678/23-28 OK.
28 vdc are present, rear junction
24 vdc cable OK.
box is faulty.
Connector MC15 OK.
Front junction box OK.
Ground wire 1435 OK.
LED composite light OK.
Repair wire 1678C-18
POSSIBLE PROBLEMS
(see schematic, Fig
FO-1) or replace wire
NO
Wire 1678C-18 faulty.
harness (Para 4-30).
Rear junction box faulty.
Verify repair, go to
Step 10 of this Fault.
YES
Replace rear junction
box (Para 4-26).
Verify repair, go to
Step 10 of this Fault.
10.
KNOWN INFO
TEST OPTIONS
Truck electrical system OK.
Verify repair.
Do blackout stoplights
All other trailer lights operate.
Taillights operate indicating
operate?
REASON FOR QUESTION
LED composite light Ground
is OK.
If blackout stoplights operate,
Blackout stoplight OK.
fault has been corrected.
Blackout stoplight lamp OK.
Wire 1678/23-28 OK.
24 vdc cable OK.
Connector MC15 OK.
Front junction box OK.
Wire 1678C-18 OK.
Rear junction box OK.
Ground wire 1435 OK.
LED composite light OK.
Fault not corrected.
POSSIBLE PROBLEMS
NO
Notify supervisor.
YES
Fault corrected.
4-96
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