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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
13. 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.
All other trailer lights operate.
Wire 1012B OK.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Are 10 to 14 vdc measured on
If voltage is not supplied to
wire 1012B at rear marker
marker light, marker light will
Wire 1012B faulty.
light?
not operate.
Wire 1435 faulty.
Marker light faulty.
Repair wire 1012B
(see schematic, Fig
NO
FO-1.1) or replace
rear marker light wire
harness (Para 4-30.1).
YES
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
All other trailer lights operate.
Wire 1012B OK.
REASON FOR QUESTION
Wire 1012B OK.
Is continuity measure between
POSSIBLE PROBLEMS
If rear marker light ground is
rear marker light ground
faulty, corroded, or loose, light
contact and a known good
will not operate.
Wire 1435 faulty.
ground?
Marker light faulty.
Repair wire 1435
(see schematic, Fig
FO-1.1) or replace
rear marker light wire
NO
harness (Para 4-30.1).
Verify repair, go to
Step 4
of this Fault.
YES
Replace rear marker
light assembly
(Para 4-28.1). Verify
repair, go to Step 4
of this Fault.
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