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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.
Continuity test.
on Page 118.11
All other trailer lights operate.
REASON FOR QUESTION
If voltage is not supplied to
POSSIBLE PROBLEMS
Are 22 to 28 vdc measured on
rear side marker light, marker
wire 1012B at rear side marker
light will not operate.
Wire 1012B faulty.
light?
Wire 1435 faulty.
Rear 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.
on Page 118.11
Continuity test.
All other trailer lights operate.
Wire 1012B ok.
REASON FOR QUESTION
Is continuity measured
If rear side marker light ground
POSSIBLE PROBLEMS
between rear side marker
is faulty, corroded, or loose,
light ground contact and a
light will not operate.
Wire 1435 faulty.
known good ground?
Rear marker light faulty.
Repair wire 1435 (see
schematic, Fig
FO-1.1) or replace
NO
rear side marker light
wire harness (Para
4-30.1). Verify repair,
go to Step 4 of this
Fault.
YES
Replace rear side
marker light assembly
(Para 4-27.1). Verify
repair, go to Step 4 of
this Fault.
4-118.10
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