TOPIC 5. ELECTRICAL WIRING

TM 10-3930-644-14&P

TOPIC 5. ELECTRICAL WIRING

A. DESCRIPTION

CAUTION

Because of the potential danger of

For the most part, the electrical wiring that interconnects

electrical shock, it is wise to

all the electrically operated components of the truck is

disconnect the battery cables during

grouped in a harness assembly which is properly taped

electrical repair work.

and securely clamped to the truck frame. Wherever

necessary, wires are protected by loom and rubber

Select the desired length, color and gauge wire for

grommets to prevent chafing where direct contact is

replacement. Run the new wire along the wire harness

made with the frame or the engine.

and attach it in several

Individual wires in the wiring harness are color-coded for

places with electrical tape. Attach new terminal tips to

ease of identification, since; in the covered harness, only

the replacement wire and after covering terminal wire

the extreme ends of the individual wires are visible. This

connection with tape or neoprene tubing, attach both

color coding facilitates ease of identification during

ends of wire to respective component tie point.

installation, trouble-shooting and repair.

NOTE

The wiring diagrams (Figs. 1-1 and

1-2)

show

Always keep connections clean and

connections, wire colors and wire gauges.

tight to ensure low resistance

conductivity.

B. SERVICE (REMOVAL/INSTALLATION)

Check for defective circuits

is easily accomplished.

It is recognized that replacement of one or more

Disconnect wires at both ends

of suspected circuit. With

individual wires may be necessary and that complete

a test lamp, touch test probes

to each end of circuit and

harness replacement may be impractical. Emergency

if test lamp fails to light, circuit

will have to be repaired or

repair can be made by installing a new wire between two

replaced.

points, and disconnecting the old or defective wire at

each end.

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