Isuzu N-Series. Manual - part 976

CAB AND CHASSIS ELECTRICAL 8-9

Speaker

Buzzer

Circuit breaker

Bulb

Double filament bulb

Motor

Variable register Rheo-
stat

Symbol

Meaning of Symbol

N8A5512E

N8A5513E

N8A5514E

N8A5515E

N8A5516E

N8A5517E

N8A5518E

Coil (inductor), solenoid,
magnetic valve

Relay

Connector

Light emitting diode

Reed switch

Condenser

Horn

Symbol

Meaning of Symbol

N8A5519E

N8A5520E

N8A5521E

N8A5522E

N8A5523E

N8A5524E

N8A5525E

8-10 CAB AND CHASSIS ELECTRICAL

Abbreviations

Vacuum switching valve

Symbol

Meaning of Symbol

N8A5526E

Abbreviation

Meaning of Abbreviation

Abbreviation

Meaning of Abbreviation

A

Ampere (S)

kW

kilowatt

ABS

Anti-lock brake system

LH

Left hand

ASM

Assembly

LWB

Long wheel base

AC

Alternating current

M/T

Manual transmission

A/C

Air conditioner

OD

Over drive

ACC

Accessories

OPT

Option

C/B

Circuit breaker

QOS

Quick on start

CSD

Cold start device

RH

Right hand

DIS

Direct ignition system

RR

Rear

EBCM

Electronic brake control module

RWAL

Rear wheel anti-lock brake system

ECGI

Electronic control gasoline injection

ST

Start

ECM

Electronic control module

STD

Standard

ECU

Electronic control unit

SW

Switch

EFE

Early fuel evaporation

SWB

Short wheel base

4X4

Four-wheel drive

V

Volt

FL

Fusible link

VSV

Vacuum switching valve

FRT

Front

W

Watt (S)

H/L

Headlight

WOT

Wide open throttle

IC

Integrated circuit

W/

With

IG

Ignition

W/O

Without

CAB AND CHASSIS ELECTRICAL 8-11

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. Wires belonging to a system’s subcircuits
will have a colored stripe. Striped wires use the following
code to show wire size and colors.

Abbreviations are used to indicate wire color within a cir-
cuit diagram.
Refer to the following table.

Wire Color Coding

Distinction of Circuit by Wire Base Color

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, shown below, are specified by AWG
(American Wire Gauge) (Nominal size means approxi-
mate cross sectional area).

N8A5023E

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

Base color

Circuits

Base color

Circuits

B

 Starter circuit

 Y

 Instrument circuit

W

 Charging circuit

L, O, BR,

LG, GR,
P, LB, V

Other circuit

R

 Lighting circuit

G

Signal circuits

8-12 CAB AND CHASSIS ELECTRICAL

Wire Size Table

Fuse, Fusible Link and Circuit Breaker

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 encases 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 wire or 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 com-
ponents in the circuit.
Determine the cause of the overloaded before replacing
the fuse.
The replacement fuse must have the same amperage
specifications as the original fuse.
Never replace a blown fuse with a fuse of a different am-
perage specification.
Doing so can result in an electrical fire or other serious
circuit damage. A blown fuse is easily identified.

N8A0025E

Nominal size

Cross sectional area 

(mm

2

)

Outside diameter 

(mm)

 Allowable current 

(A)

 AWG size

(cross reference)

0.3
0.5

0.85
1.25

2
3
5
8

15
20

0.372
0.563
0.885
1.287
2.091
3.296
5.227
7.952
13.36
20.61

1.8
2.0
2.2
2.5
2.9
3.6
4.4
5.5
7.0
8.2

9

12
16
21 
28

37.5

53
67
75
97

22
20
18
16
14
12
10

8
6
4

N8A0026E