TM 9-2330-388-14
Section VII. MAINTENANCE OF CHASSIS ELECTRICAL SYSTEM
(7) Right Rear Composite Light Lead
4-10.
Chassis Wiring
Assembly. This lead is located in the right rear composite
light box. It connects to the two marker lights and to the
WARNING
composite light, fig. 4-8.
When
troubleshooting
an
electrical
(8) Left Rear Composite Lift Lead Assembly.
malfunction
or
performing
electrical
This lead (fig. 416) is located in the left rear composite
maintenance,
always
disconnect
light box. It connects to the wiring harness in two places
Intervehicular
electrical
cable
from
and to the left composite light, fig. 4-8.
semitrailer, and negative battery cables at
batteries. Failure to follow this warning may
(9) Connector Lead Assembly. This lead is
allow a spark and subsequent explosion,
located in the left rear composite light box, fig. 4-8. It is
resulting in serious injury or death to
made up of six different leads, of which two connect to
personnel.
left rear marker lights, two to the wiring harness, one to
triple marker light lead, and one to left composite light.
General. The chassis wiring of the semitrailer:
a.
consists of one wiring harness, seven electrical lead
b.
Repair. Most of the wiring can be repaired
assemblies, and one receptacle assembly. Refer to
without removing the harness and leads from the
semitrailer.
connections of chassis electrical system. Wiring is as
follows:
(1) Clean end of harness leads with a damp
cloth.
(1) Receptacle Assembly.
The receptacle
mounted on the left front side of the semitrailer, fig. 4-8.
(2) Check ends of wire harness for frayed
It connects the electrical system of the towing vehicle
insulation and broken wires. Tape or replace frayed
with that of the semitrailer. The main wiring harness of
wires.
the semitrailer connects to the receptacle.
(3) Inspect wires for bent, broken, or missing
(2) Wiring Harness. This harness runs the tire
terminals. Replace missing or damaged terminals.
length of the semitrailer through conduit, the rear
composite light box, to the right rear composite. light box,
c.
Replacement of Chassis Wiring.
(1) Composite Light and Connector Lead
connect to the lights on the semitrailer.
Assemblies Replacement.
(a) Remove six screws that secure composite
(3) Rear Triple Marker Light Lead Assembly.
light box cover to the light box, fig. 4-15. Remove cover
This lead is threaded from the triple marker box through
and gasket.
conduit to the left composite light box, fig. 4-8. There it
connects to one of six leads of the connector lead
(b) Start removing the old lead terminals one
assembly.
connection at a time. As each lead terminal is removed,
connect the correct lead terminal of the replacement lead
(4) Right Front Marker Light Lead. This lead is
before removing the next one. Continue this process
threaded from the right front marker box through conduit
until the old lead is removed and the new one is
to the left side of the semitrailer, fig. 4-8. There it
completely connected into the circuit.
connects into the receptacle wiring, the wiring harness
and lead from the left front marker light.
(c) Replace composite light cover and gasket.
Secure with six screws.
(5) Left Front Marker Light Lead Assembly.
This lead connects to the left front marker light and to the
(d) Test operation of lights.
right front marker light lead, fig. 4-8.
(2) Triple
Marker
Light
Lead
Assembly
(6) Right Side Marker Light Lead Assembly.
Replacement.
This lead is threaded from the right center marker light
box through conduit to the left center marker light box.
(a) Remove six screws that secure composite
There it connects to the wiring harness and to the left
light box cover to the light box, fig. 4-15. Remove cover
center marker light, fig. 4-8.
and gasket.
4-72
