Circuit ISUZU KB P190 2007 Workshop Repair Manual

8A-14 ELECTRICAL-BODY AND CHASSIS
Distinction of Circuit by Wire Base Color
Base color Circuits Base color Circuits
B Starter circuit and grounding circuit Y Instrument circuit
W Charging circuit L, O, BR,
R Lighting circuit LG, GR, Other circuits
G Signal circuit P, LB, V




Wire Size
W ire size is specified with the metric gauge system.
The metric gauge system gives the wire size in cross sectional
area measured in square millimeters.


Wire Size Specifications
Nominal size Cross sectional area
(mm2) Outside diameter
(mm) Allowable current
(A)
0.3 0.372 1.8 9
0.5 0.563 2.0 12
0.85 0.885 2.2 16
1.25 1.287 2.5 21
2 2.091 2.9 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


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ELECTRICAL-BODY AND CHASSIS 8A-15
NormalBlown

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.
W hen 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 components in the circuit.
Determine the cause of the overloaded before replacing the
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.
Normal Blown


FUSIBLE LINK
The fusible link is primarily used to protect circuits where high
amounts of current flow and where is would not be practical to
use a fuse.
For example, the starter circuit.
W hen 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.


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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8A-16 ELECTRICAL-BODY AND CHASSIS


RELAY
Battery and load location may require that a switch be placed
some distance from either component.
This means a longer wire and a higher voltage drop
1. The
installation of a relay between the battery and the load reduces
the voltage drop
2.
Because the switch controls the relay, amperage through the
switch can be reduced.


Relay Specifications and Configurations
Name/ Color Rated
voltage/ Coil resistance Internal circuit
Name/
color Rated
Voltage/Coil resistance Internal circuit
1T
(MICRO ISO)
/Black 12V
Approx. 92 Ω
Minimum
operating
voltage: 7V at
20 °C (77 °F)

1M (MINI
ISO)
/Black 12V Approx.
94 Ω Minimum
operating
voltage: 7V at
20 °C (77 °F)
1M
(MICRO ISO)
/Black 12V
Approx. 132-3
Ω Minimum
operating
voltage: 7V at
20 °C (77 °F)

1M
(power)/ Black 12V Approx.
94 Ω Minimum
operating
voltage: 7V at
20 °C (77 °F)
* Relay contact shown in the wiring diagram indicates condition before actuation.


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ELECTRICAL-BODY AND CHASSIS 8A-17
DIODE
Diode Specifications and Configurations

SHAPE
MARK/
COLOR
CONSTRUCTION CHECKING
THERE SHOULD BE CONTINUITY IN
EITHER A OR B W HEN A CIRCUIT
TESTER IS CONNECTED W ITH
DIODE TERMINAL



BLACK

21
CONNECTION A+-
PATTERN B-+
TERMINAL NO.




BLACK
321
-+
CONNECTION+-
PATTERN+-
-+B
A
TERMINAL NO.




BLACK

321
-+
CONNECTION+-
PATTERN+-
-+B
A
TERMINAL NO.




BLACK


4321
+-
A-+
CONNECTION-+
PATTERN-+
B+-
+-
TERMINAL NO.


Maximum Rating (Temp.=25 °
°°
°
C)
Items Rating Remarks
Peak reverse voltage 400V
Transient peak reverse voltage 500V
Average output current 1.5A Temp.=40°C
W orking ambient temperature -30°C ∼80 °C
Storage temperature -40°C ∼100ßC

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8A-18 ELECTRICAL-BODY AND CHASSIS


CONNECTOR
The connector pin shape determines whether the connector is
male or female.
The connector housing configuration does not determine
whether a connector is male or female.



The symbol illustrated in the figure is used as connector in the
circuit this section.




RTW 78ASH003101

Connector is identified with a number.




RTW 78ASH003201

The applicable terminal number is shown for each connector.



Connector terminal numbers are clearly shown.
Male side connector terminal numbers are in sequence from
upper right to lower left.
Female side connector terminal numbers are in sequence from
upper left to lower right.
NOTE:
For those connectors on which specific terminal numbers
on symbols are shown, the terminal numbers or symbols
are used in the circuit diagram, irrespective of the above
rule.


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ELECTRICAL-BODY AND CHASSIS 8A-19
Battery-1

BATTERY
Inspection
1. Check the battery terminals 1 for corrosion.
2. Check the battery cables
2 for looseness.
3. Check the battery case
3 for cracks and other damage.
4. Check the battery electrolyte level.
Battery-2

Battery Replacement
1. Disconnect the battery ground cable 1.
2. Disconnect the battery positive cable
2.
3. Remove the battery clamp
3.
4. Remove the battery
Caution:
It is important that the battery ground cable be removed
first.
Removing the battery positive cable first can result in a
short circuit.


Jump Starting the Engine with a Booster Battery
The following description assumes that you are using a booster
battery mounted on a second vehicle.
The listed steps (with some minor modifications) are also
applicable if you are using a naked booster battery or special
battery charging equipment.


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8A-22 ELECTRICAL-BODY AND CHASSIS
READING THE CIRCUIT DIAGRAM
In this manual, each system has its own parts location illustration and circuit diagram.
And connector configurations used in the circuit diagram are shown at the end of this manual.
PARTS LOCATION: The parts location shows the location of the connectors
1 and the harnesses 2 used in the
each system.
CIRCUIT DIAGRAM: The circuit diagram shows the power supply
3, the load or loads 4 and the grounding
point(s)
5.
CONNECTOR LIST: The connector configuration shows each connector's number
6, configuration 7 and the pin
numbers
8, parts name 9 , connector color 10.

PARTS LOCATION


RTW 780MF002401

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ELECTRICAL-BODY AND CHASSIS 8A-23
CIRCUIT DIAGRAM



CONNECTOR LIST




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ELECTRICAL-BODY AND CHASSIS 8A-35

FUSE BLOCK CIRCUIT C24SE Sheet 1/2




RTW 68AXF005801

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8A-36 ELECTRICAL-BODY AND CHASSIS

FUSE BLOCK CIRCUIT C24SE Sheet 2/2



RTW 68AXF005901

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