Opel Frontera UBS. Service manual — part 2703
8D–12
WIRING SYSTEM
Parts for Electrical Circuit
Wiring – Wire color
All wires have color–coded insulation.
Wires belonging to a system’s main harness will have a
single color (1). Wires belonging to a system’s subcircuits
will have a colored stripe (2). Striped wires use the
following code to show wire size and colors.
Example: 0.5 G / R
Red (Stripe color)
Green (Base color)
Wire size (0.5 mm
2
)
Wiring – Wire Color Coding
Abbreviations are used to indicate wire color within a circuit diagram.
Refer to the following table.
Color Coding
Meaning
Color Coding
Meaning
B
Black
BR
Brown
W
White
LG
Light green
R
Red
GR
Grey
G
Green
P
Pink
Y
Yellow
LB
Light blue
L
Blue
V
Violet
O
Orange
1
2
WIRING SYSTEM
8D–13
Wiring – Wire Size
The size of wire used in a circuit is determined by the
amount of current (amperage), the length of the circuit,
and the voltage drop allowed. The following wire size and
load capacity are specified. (Nominal size means
approximate cross sectional area (1).)
Wiring – Wire Size Table
Nominal size
Cross sectional
Outside diameter
Allowable
area (mm
2
)
(mm)
current (A)
0.3
0.372
1.5
9
0.5
0.563
1.7
12
0.85
0.885
1.9
16
1.25
1.287
2.2
21
2
2.091
2.7
28
3
3.296
3.6
37.5
5
5.227
4.4
53
8
7.952
5.5
67
15
13.36
7.0
75
20
20.61
8.2
97
1
8D–14
WIRING SYSTEM
Fuse
Fuses are the most common form of circuit protection
used in vehicle wiring. A fuse is a thin piece of wire or strip
of metal encased in a glass or plastic housing. It is wired
in series with the circuit it protects. When there is an
overload of current in a circuit, such as a short of a ground,
the metal strip is designed to burn out and interrupt the
flow of current. This prevents a surge of high current from
reaching and damaging other components in the circuit.
Determine the cause of the overloaded before replacing
the fuse.
The replacement fuse must have the same amperage
specification as the original fuse.
Never replace a blown fuse with a fuse of a different
amperage specification.
Doing so can result in an electrical fire or other serious
circuit damage. A blown fuse is easily identified as shown
in the figure.
WIRING SYSTEM
8D–15
Fusible Link
The fusible link is primarily used to protect circuits where
high amounts of current flow and where it would not be
practical to use a fuse. For example, the starter circuit.
When a current overload occurs, the fusible link melts
open and interrupts the flow of current so as to prevent
the rest of the wiring harness from burning.
Determine the cause of the overload before replacing the
fusible link. the replacement fusible link must have the
same amperage specification as the original fusible link.
Never replace a blown fusible link with fusible link of a
different amperage specification. Doing so can result in
an electrical fire or other serious circuit damage.
A blown fusible link is easily identified as shown in the
figure.
Normal
Blown
Fusible Link Specifications
Type
Rating
Case Color
Maximum Circuit Current (A)
Connector
30A
Pink
15
Connector
40A
Green
20
Bolted
50A
Red
25
Bolted
60A
Yellow
30
Bolted
80A
Black
40
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