Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw

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Electrical Diagrams and Wiring 111
CIRCUIT INFORMATION
A 2 18 LB/YL
COLOR OF WIRE
(LIGHT BLUE WITH YELLOW TRACER)
GAUGE OF WIRE
(18 GAUGE)
PART OF MAIN CIRCUIT
(VARIES DEPENDING ON EQUIPMENT)
MAIN CIRCUIT IDENTIFICATION
WIRE COLOR CODE CHART
STANDARD
TRACER
COLOR CODE COLOR COLOR
BL BLUE WT
BK BLACK WT
BR BROWN WT
DB DARK BLUE WT
DG DARK GREEN WT
GY GRAY BK
LB LIGHT BLUE BK
LG LIGHT GREEN BK
OR ORANGE BK
PK PINK BK or WT
RD RED WT
TN TAN WT
VT VIOLET WT
WT WHITE BK
YL YELLOW BK
* WITH TRACER
Figure 6-42. Chrysler circuit identification and wire
color codes. (DaimlerChrysler Corporation)
Figure 6-43. GM diagrams printed in color in the service
manual include this table of color abbreviations.
(GM Service and Parts Operations)
the Toyota diagram in Figure 6-45 simply has the
color name printed on the wires; wire gauge is not
identified in this drawing.
For more information about wire color coding,
see the “Copper Wiring Repair” in Chapter 6 of
the Shop Manual.
THE LANGUAGE
OF ELECTRICAL
DIAGRAMS
In this chapter, illustrations from GM, Chrysler,
Ford, Toyota, and Nissan show how different manufacturers
present electrical information. Note that
many component symbols and circuit identification
do not look exactly the same among different vehicle
manufacturers. Once you become familiar with the
diagrams, the differences become less confusing.
Circuit Numbers
If the wire is labeled with a circuit number, as in
Figures 6-41 and 6-44, those circuits are identified in
an accompanying table. The top half of Figure 6-42
shows the Chrysler method of identifying circuits
with a letter and number. Any two wires with the
same circuit number are connected within the same
circuit. Some General Motors service manuals contain
current-flow diagrams developed by SPX Valley
Forge Technical Information Systems; However,
GM no longer uses these diagrams. Electrical circuit
diagrams are printed in color so the lines match the
color of the wires. The name of the color is printed
beside the wire (Figure 6-46). The metric wire gauge
may also be printed immediately before the color
name. Other GM drawings contain a statement that
all wires are of a certain gauge, unless otherwise
identified. If this is the case, only some wires in the
drawing have a gauge number printed on them.
The Ford circuit and table in Figure 6-44 are
for a heater and air conditioner electrical circuit.
The wire numbers are indicated by code numbers,
which are also circuit numbers. Again, no wire
gauges are identified in this example.
explains what the letters and numbers stand for. This
Chrysler diagram contains code information on wire
gauge, circuit numbers, and wire color. Circuit numbers
are discussed later in this chapter. Figures 6-41,
6-42, 6-43, and 6-44 show how Chrysler, GM, and
Ford may present color-code information. Note that
Wire Sizes
Another piece of information found in some electrical
diagrams is the wire size. In the past, vehicles
built in the United States used wire sizes specified
by gauge. Gauge sizes typically vary from 2 for a