Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1273

8–12 ELECTRICAL-BODY AND CHASSIS

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 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

D08RV684

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.
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.

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

ELECTRICAL-BODY AND CHASSIS 8–13

CIRCUIT BREAKER

The circuit breaker is a protective device designed to
open the circuit when a current load is in excess of rated
breaker capacity.  If there is a short or other type of
overload condition in the circuit, the excessive current
will open the circuit between the circuit breaker terminals.
The reset knob pops out when the circuit is open.  Push
the reset knob in place to restore the circuit after repairing
it.

Push

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

*  Relay contact shown in the wiring diagram indicates condition before actuation.

1

2

RELAY

LOAD

LOAD

D08RV709

060RV005

Rated

Name/

voltage/

Internal circuit

Color

Coil

resistance

12V

1T

Approx. 90

Ω

(MR5C)/

Minimum

Black

operating
voltage: 7V
at 25°C(77°F)

12V

1T

Approx. 90

Ω

(MR5C)/

Minimum

Brown

operating
voltage: 10.5V
at 25°C(77°F)

4

1

3

2

5

2

1

3

4

5

8–14 ELECTRICAL-BODY AND CHASSIS

DIODE

Diode Specifications and Configurations

SHAPE

MARK/

COLOR

CONSTRUCTION

CHECKING

BLACK

BLACK

CONNECTION
PATTERN

2

1

A

B

+

–

BLACK

3

2

1

3

2

1

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

4

3

2

+

–

+

1

–

+

–

–

+

+

–

+

–

BLACK

4

3

2

1

THERE SHOULD BE CONTINUITY IN
EITHER A OR B WHEN A CIRCUIT
TESTER  IS CONNECTED WITH
DIODE TERMINAL

TERMINAL NO.

CONNECTION
PATTERN

A

B

TERMINAL NO.

CONNECTION
PATTERN

A

B

TERMINAL NO.

CONNECTION
PATTERN

A

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

Working ambient temperature

–30°C~80°C

Storage temperature

–40°C~100°C

ELECTRICAL-BODY AND CHASSIS 8–15

CONNECTOR

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

Female
connector

Connector
pin shape

Male
connector

D08RV685

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

Female side connector

Male side connector

D08RV710

Connector is identified with a number.

W-38

5

W-38

7

W-38

1

W-38

6

4

W-38

SHIFT LOCK

Connector number

0.5R/L

0.85W/L

D08RV711

The applicable terminal number is shown for each
connector.

W-38

5

W-38

7

W-38

1

W-38

6

4

W-38

SHIFT LOCK

Terminal number

0.5R/L

0.85W/L

D08RV712

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.

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

Male side connector

Female side connector

Terminal number

D08RV713