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Page Title:
REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) |
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 TM 9-2330-385-14
14. REAR MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP) (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 118.17
All other lights on trailer
operate.
REASON FOR QUESTION
If voltage is not supplied to
rear marker light, marker light
Are 22 to 28 vdc measured on
POSSIBLE PROBLEMS
will not operate.
wire 1012B at rear marker
light connector?
Wire 1012B faulty.
Wire 1435 faulty.
Rear marker light faulty.
Repair wire 1012B (see
schematic, Fig FO-1.1)
or replace rear maker
NO
light wire harness (Para
4-30.1). Verify repair,
go to Step 4 of this
Fault.
YES
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
on Page 118.17
All other lights on trailer
operate.
REASON FOR QUESTION
Wire 1012B OK.
Is continuity measured
If rear marker light ground is
between rear marker light
faulty, corroded, or loose, light
POSSIBLE PROBLEMS
ground contact and a known
will not operate.
good ground?
Wire 1435 faulty.
Rear marker light faulty.
Repair wire 1435 (see
schematic, Fig
FO-1.1) or replace
NO
rear marker light wire
harness (Para
4-30.1). Verify repair,
go to Step 4 of the
Fault.
YES
Replace rear marker
light assembly (Para
4-28.1). Verify repair,
go to Step 4 of this
Fault.
4-118.16
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