Isuzu N-Series. Manual - part 1010

CAB AND CHASSIS ELECTRICAL 8-145

1-5. Headlight on The Left (or Right) Side in Low (or High)-beam Inoperative

1-6. Headlight Beam Does Not Change

• IS THE BULB NORMAL?

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT
[LOW BEAM]
BETWEEN 1  B-4  (OR 1  B-73 ) AND 3  X-6  
[HIGH BEAM]
BETWEEN 2  B-4  (OR 2  B-73 ) AND 1  X-6

YES

NO

REPLACE THE BULB

N8A0122E

N8A0123E

8-146 CAB AND CHASSIS ELECTRICAL

1-7. Headlight Remains On when the Lighting SW is Turned Off

1-8. Headlight Comes On with The Lighting SW at The Clearance Light Position

• IS THE LIGHTING RELAY NORMAL?

• DISCONNECT THE LIGHTING SW CONNECTOR

• IS THE CONTINUITY BETWEEN THE SWITCH

CONNECTOR TERMINALS 1  B-70  AND 4  B-70
NORMAL?

YES

NO

REPLACE THE LIGHTING RELAY

REPAIR A SHORT CIRCUIT BETWEEN 4  X-3  AND 
1  B-70  

YES

NO

REPAIR OR REPLACE THE LIGHTING SW

N8A0124E

• DISCONNECT THE LIGHTING SW CONNECTOR

• WITH THE LIGHTING SW AT THE CLEARANCE LIGHT

POSITION, IS THE CONTINUITY BETWEEN 1  B-70
AND 4  B-70  NORMAL?
(NO CONTINUITY NORMAL)

NO

REPAIR OR REPLACE THE LIGHTING SW

N8A0125E

CAB AND CHASSIS ELECTRICAL 8-147

2. Fog Light
2-1. Both Fog Lights Inoperative (While Lighting Switch is On)

• IS FUSE  F-6  (10A) OR  F-8  (10A) NORMAL?

• IS THE TAIL RELAY NORMAL?

YES

NO

REPLACE THE FUSE

• REMOVE THE FOG LIGHT SW

• WHEN THE SWITCH IS "ON", IS THERE CONTINUITY

BETWEEN THE SWITCH CONNECTOR TERMINALS 
3  B-87  AND 6  B-87  ?  

YES

NO

REPLACE THE RELAY

• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE

HARNESS SIDE CONNECTOR 3  B-87  AND THE
GROUND, WHILE THE LIGHTING SW IS ON?
(LIGHTING OPERATION IS NORMAL)

YES

NO

REPAIR OR REPLACE THE SW

• REPAIR A POOR CONNECTION AT THE CONNECTORS

OR AN OPEN CIRCUIT BETWEEN 6  B-87  AND 1  B-3  

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN 
8  B-70  AND 5  X-15

N8A0126E

8-148 CAB AND CHASSIS ELECTRICAL

2-2. Fog Light on The Left (or Right) Side Inoperative (While Lighting Switch is On)

Notice:
Figures in parenthesis “( )” indicate place of inspection for the fog light on the right.

2-3. Fog Light Remains On

• IS THE BULB NORMAL?

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 2  B-3  AND  B-7  
(2  B-72  AND  B-7  )

YES

NO

REPLACE THE BULB

N8A0127E

• DO THE TAILLIGHTS GO OFF?

REPAIR OR REPLACE THE FOG LIGHT SWITCH

YES

NO

REPLACE THE TAIL RELAY

N8A0128E