Wiring color codes are used by manufacturers to
assist the mechanics in identifying the wires used in
many circuits and making repairs in a minimum of
time. No color code is common to all manufacturers.
For this reason, the manufacturers service manual is a
must for speedy troubleshooting and repairs.
Wiring found on tactical equipment (M-series) has
no color. All the wires used on these vehicles are black.
Small metal tags (fig. 2-87), stamped with numbers or
Figure 2-87.Metal tag wire identification.
codes, are used to identify the wiring illustrated by
diagrams in the technical manuals. These tags are
securely fastened near the end of individual wires.
Wiring diagrams (fig. 2-88) are drawings that
show the relationship of the electrical components and
wires in a circuit. They seldom show the routing of the
wires within the electrical system of the vehicle.
Often you will find ELECTRICAL SYMBOLS
used in wiring diagrams to simulate individual
components. Figure 2-89 shows some of the symbols
you may encounter when tracing individual circuits in
a wiring diagram.
WIRE TERMINAL ENDS
Wire terminals are divided into two major
classesthe solder type and the solderless type, which
is also known as the pressure or crimp type. The solder
Figure 2-88.Wiring diagram of a passenger vehicle showing standard equipment and color code for wires.