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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).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
on Page 4-31
All other trailer lights operate.
Front marker light lamp OK.
REASON FOR QUESTION
Wire 1435-23 OK.
Is continuity measured
If continuity is not measured
POSSIBLE PROBLEMS
between center contact of
between center contact of
front marker light socket and
socket and connector, voltage
Marker light faulty.
cannot be supplied to light lamp.
connector?
Front junction box faulty.
Wire 1012-24 faulty.
Replace front marker
light (Para 4-27).
NO
Verify repair, go to
Step 6 of this Fault.
YES
5.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
on Page 4-31
Voltage test.
All other trailer lights operate.
Front marker light lamp OK.
REASON FOR QUESTION
Wire 1435-23 OK.
Are 22 to 28 vdc measured on
Front marker light OK.
If front junction box assembly or
front junction box circuit
wire 1012-24 are faulty, power
POSSIBLE PROBLEMS
board at terminal 24?
will not be supplied to marker
light.
Front junction box faulty.
Wire 1012-24 faulty.
Replace front junction
box assembly
NO
Verify repair, go to
Step 6 of this Fault.
YES
Repair wire 1012-24
(see schematic, Fig
side marker harness
Verify repair, go to
Step 6 of this Fault.
4-30
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