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Page Title:
FRONT SIDE MARKER LIGHT DOES NOT OPERATE (CONT). |
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 TM 9-2330-385-14
1. FRONT SIDE MARKER LIGHT DOES NOT OPERATE (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-29
All other trailer lights operate.
Light lamp OK.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Are 22 to 28 vdc measured on
If voltage is not supplied to
center contact of front marker
center contact of front marker
Wire 1435-23 faulty.
light socket, marker light will not
light socket?
Front marker light faulty.
operate.
Front junction box faulty.
Wire 1012-24 faulty.
Go to Step 4 of this
NO
Fault.
YES
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
on Page 4-29
All other trailer lights operate.
Light lamp OK.
REASON FOR QUESTION
Front junction box OK.
Is continuity measured
Wire 1012-24 OK.
If front marker light ground is
between front marker light
faulty, light will not operate.
socket ground and
POSSIBLE PROBLEMS
wire 1435-23?
Wire 1435-23 faulty.
Front marker light faulty.
Replace front side
marker light assembly
NO
Verify repair, go to
Step 6 of this Fault.
YES
Repair wire 1435-23
(see schematic
Fig FO-1) or replace
front side marker
harness (Para 4-30).
Verify repair, go to
Step 6 of this Fault.
4-28
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