Isuzu N-Series. Service manual - part 1089

8-68 CAB AND CHASSIS ELECTRICAL

Circuit Diagram

NHR55, NKR55

1

E-8

1

B-51

B-51

X-20

X-20

X-20

X-20

B-10

H-5

B-10

7

B

ST

ACC

ON

1

B-67

B-67

H-7

B-10

B-10

B-10

P-1

P-2

P-5

B-67

2

3

4

2

4

5

E-3

5

B-10

13

6

8

6

37

4

FRAME

FL-1  100A

MAIN

FL-2  50A

KEY SW

FL-3  60A

GLOW

5B/L

3W/L

STARTER SW

3B/Y

3B/Y

F-16  10A

METER

F-22   10A

STARTER

RELAY; GLOW

GLOW 

PLUG

HEADLIGHT BRACKET (LH)

3B

0.5B/Y

0.5B/Y

0.5B/Y

0.5B/W

RELAY; STARTER (4)

GLOW INDICATOR LIGHT (METER)

0.3B

0.5GR

3W/B

0.3B/R

5B/L

22

FUEL CUT

F-9   10A

0.5B/Y

0.5B/Y

0.5B/Y

0.3O/L

THERMO SW(GLOW)

FUEL CUT SOLENOID

14

12

H-14

H-5

1

E-15

CSD SOLENOID

1

E-24

X-26

4

X-26

5

X-26

32

1.25L

1.25B/O

15

H-14

5

H-14

0.3B/W

0.5B/O

0.5B/O

B-7

0.5B/Y

0.3B/R

H-5

RELAY; CSD

1.25Y

0.5Y

0.5L

H-8

3

X-26

QOS II CONTROL UNIT

2L

FUSE BLOCK

3

N8A5074E

CAB AND CHASSIS ELECTRICAL 8-69

NKR66, NPR66, NQR66

H-14

H-5

1

B-51

B-51

X-20

X-20

X-20

X-20

B-10

E-8

H-14

H-5

B-10

7

B

ST

ACC

ON

1

B-67

B-67

H-7

B-10

H-8

B-10

B-10

B-7

P-1

P-2

P-3

P-4

P-5

B-67

2

3

4

22

2

4

5

16

3

E-3

5

B-10

13

6

8

6

8

37

1

4

FRAME

FL-1

MAIN

FL-2  40A

KEY SW

FL-3  60A

GLOW

3B/L

3W/L

STARTER SWITCH

3B/Y

3B/Y

F-16  10A

METER

F-22   10A

STARTER

RELAY; GLOW

GLOW PLUG

HEADLIGHT BRACKET (LH)

3B

3B/Y

0.3B/R

0.3B/R

0.5B/Y

0.5B/Y

0.5B/Y

0.5B/Y

0.3O/L

0.3B/Y

0.5Y

0.5B/W

0.3B/W

RELAY; STARTER (4)

THERMO SWITCH (GLOW)

GLOW INDICATOR LIGHT (METER)

QOS II CONTROL UNIT

0.3B

0.5Y

3B/Y

0.5Y

2L

FUSE BLOCK

100A

or

120A

3

N8A5075E

8-70 CAB AND CHASSIS ELECTRICAL

Connector List

No.

Connector Face

B-10

B-51

B-67

B-67

E-3

E-8

E-8

E-24

007-001

6

4

1

7

3

5

2

014-001

1 2 3 4 5 6 7 8

9 1011121314

004-001

1

2

3

4

004-002

2
4

1
3

000-009

000-010

000-011

001-002

1

E-24

H-14

H-14

H-14

(4HF1)

H-14

(4HF1)

X-20

X-26

P-1

No.

Connector Face

001-003

1

016-001

1

2

3

4

5

6

7

8

9

10 11 12

13 14 15 16

016-002

4

3

2

1

8

7

6

5

12 11 10

9

16 15 14 13

016-003

1

2

3

4

5

6

7

8

9

11 12 13 14

15

16

10

016-004

4

3

2

1

9

8

7

6

5

13 12 11 10

16

15

14

005-003

1

2

3

5

4

005-006

000-004

CAB AND CHASSIS ELECTRICAL 8-71

H-5

H-7, H-8

Starter Switch

Refer to “START AND CHARGING” in this section.

Glow Indicator Light Thermo Switch

Refer to “METER AND WARNING/INDICATOR LIGHT”
in this section.

QOSII Control Unit

P-4

P-2

P-3

P-5

(12 V)

P-5

(24 V)

No.

Connector Face

000-004

000-006

000-006

000-007

000-002

1

2

3

7

8

9

13

14 15

19

20 21

25

26 27

31

32 33

34

35

36

37

4

5

6

10

11 12

16

17 18

22

23 24

28

29 30

38

39 40

6

5

4

12

11 10

18

17 16

24

23 22

30

29 28

40

39 38

3

2

1

9

8

7

15

14 13

21

20 19

27

26 25

33

32 31

34

35

36

37

N8A5488E

Terminal No.

Connected to

1

Starter switch (ON)

2

—

3

Thermo switch

4

Starter switch (ST)

5

Glow  relay

6

Ground

7

Glow indicator (Meter)

1

2

1

2

1 2 3 4

5 6 7 8

9 10 11 12 13

14 15 16 17 18

2

1

2

1

4 3 2 1

8 7 6 5

13 12 11 10 9

18 17 16 15 14

H - 6

H - 7

H - 8

N8A5489E

N8A0079E