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Page Title: TAILLIGHT(S) DO NOT OPERATE. (Cont)
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TM 9-2330-385-14
4. TAILLIGHT(S) DO NOT OPERATE (CONT).
9.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Voltage test.
Truck electrical system OK.
All other lights on trailer
operate.
REASON FOR QUESTION
Taillight lamp OK.
Are 10 to 14 vdc measured
Composite light OK.
If 10 to 14 vdc are not present at
on front junction box,
LED composite light ground
front junction box, terminal 20,
terminal 20?
wire pigtail OK.
taillight will not operate.
LED composite light OK.
12 vdc cable OK.
Connector MC16 OK.
POSSIBLE PROBLEMS
Front junction box faulty.
Replace front junction
Wire 1008-20 faulty.
NO
Rear junction box faulty.
Verify repair, go to
Step 12 of this Fault.
YES
10.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Truck electrical system OK.
Voltage test.
All other lights on trailer
operate.
REASON FOR QUESTION
Taillight lamp OK.
Are 10 to 14 vdc measured on
Composite light OK.
If wire 1008-20 is faulty, taillight
LED composite light ground
wire 1008-20 at rear junction
will not operate.
wire pigtail OK.
box, terminal 20?
LED composite light OK.
12 vdc cable OK.
Connector MC16 OK.
Front junction box OK.
POSSIBLE PROBLEMS
Repair wire 1008-20
(see schematic, Fig
Wire 1008-20 faulty.
FO-1) or replace side
Rear junction box faulty.
NO
wire harness
Verify repair, go to
Step 12 of this Fault.
YES
4-160

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