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Page Title:
REAR MARKER LIGHT(S) DO NOT OPERATE. (Cont) |
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 TM 9-2330-385-14
3. REAR MARKER LIGHT(S) DO NOT OPERATE (CONT).
6.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
on Page 4-51
All other lights on trailer
operate.
REASON FOR QUESTION
Light lamp OK.
Are 22 to 28 vdc measured on
Rear marker light OK.
If voltage is not supplied to rear
Wire 1435-34 OK.
rear junction box at
junction box terminal 31, circuit
board is faulty and rear marker
terminal 31?
POSSIBLE PROBLEMS
light will not operate.
Rear junction box
assembly faulty.
Wire 1012-31 faulty.
Replace rear junction
box assembly
NO
Verify repair, go to
Step 8 of this Fault.
YES
Repair wire 1012-31
(see schematic,
Fig FO-1) or replace
rear marker harness
Verify repair, go to
Step 8 of this Fault.
7.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Continuity test.
on Page 4-51
All other lights on trailer
operate.
REASON FOR QUESTION
Light lamp OK.
Rear marker light OK.
Is continuity measured
If continuity is not measured on
Wire 1012-31 OK.
between rear junction box
terminal 34, rear junction box is
terminal 34 and a known good
faulty and light will not operate.
POSSIBLE PROBLEMS
ground?
If there is continuity, light is not
grounded because of faulty wire
Rear junction box
1435-34.
assembly faulty.
Wire 1435-34 faulty.
Replace rear junction
box assembly
NO
Verify repair, go to
Step 8 of this Fault.
YES
Repair wire 1435-34
(see schematic,
Fig FO-1) or replace
rear marker harness
Verify repair, go to
Step 8 of this Fault.
4-50
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