TM 5-3825-229-14&P
4-21.
WIRING (cont)
a.
Testing (cont).
(5)
Connect positive test lead to bad wire. Connect negative test lead to trailer frame.
(6)
If meter indicates 12-volts DC, wire is good.
(7)
If meter indicates zero volts, check voltage at appropriate pin in nose box receptacle. If meter
indicates 12-volts at nose box receptacle, replace wire. If meter does not indicate 12-volts at nose
box receptacle, check towing vehicle power or alternate power source.
b.
Repair.
Repair of wire is limited to-replacing terminal lugs. It is not necessary to remove wire to replace lugs.
c.
Removal.
(1)
Disconnect suspected bad wire from 12-volt DC receptacle in-nose box.
(2)
Disconnect wire from dead marker, tail, turn or stop light. Refer to para. 4-16 or 4-17. Remove light
assembly.
(3)
Tie 400 inch (34 feet) length of new wire to terminal of disconnected wire. Let wire hang outside of
semitrailer.
(4)
Pull wire out from front of semitrailer through nose box.
d.
Installation.
(1)
Feed end of new wire through conduit pipe to conduit hole in box.
(2)
Feed wire into conduit hole in nose box while pulling wire out of empty light socket hole.
(3)
Connect wire to light assembly and install light assembly on semitrailer. Refer to para. 4-16 or 4-17.
(4)
Connect wire to proper terminal of 12-volt receptacle in nose box. Refer to para. 4-20.
(5)
Connect intervehicular cables. Refer to para. 4-23.
(6)
Connect battery cables. Refer to para. 4-22.
e.
Wiring Diagrams.
The electrical schematics and wiring diagrams are shown on the following pages.
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