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Page Title: REAR SIDE MARKER LIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont)
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TM 9-2330-385-14
12. REAR SIDE MARKER LIGHT(S) DO NOT OPERATE
(S/N YB6122 075 AND UP) (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Voltage test.
Truck electrical system OK.
All other trailer lights operate.
REASON FOR QUESTION
Are 10 to 14 vdc measured on
If voltage is not supplied to rear
POSSIBLE PROBLEMS
wire 1012B at rear side marker
side marker light, marker light
light?
Wire 1012B faulty.
will not operate.
Wire 1012B faulty.
Wire 1435 faulty.
Marker light faulty.
Repair wire 1012B
(see schematic, Fig
FO-1.1) or replace
rear side marker light-
NO
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.
All other trailer lights operate.
Wire 1012B OK.
REASON FOR QUESTION
If rear side marker light ground
Is continuity measured
is faulty, corroded, or loose,
between rear side marker light
POSSIBLE PROBLEMS
light will not operate.
ground contact and a known
good ground?
Wire 1435 faulty.
Marker light faulty.
Repair wire 1435
(see schematic, Fig
FO-1.1) or replace rear
side marker light wire
NO
Verify repair, go to
Step 4 of this
Fault.
YES
Replace rear side
marker light assembly
repair, go to Step 4
of this Fault.
4-202.10

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