Isuzu N-Series. Manual - part 1018

CAB AND CHASSIS ELECTRICAL 8-177

1. Both Clearance Lights Inoperative

Notice:
Figure in parenthesis “( )” indicates place of inspection for clearance light on the right side.

•

ARE BOTH TAILLIGHTS OPERATIVE?

•

IS  B-7  SECURELY GROUNDED?

YES

NO

TURN TAILLIGHTS ON  (REFER TO TAILLIGHT
DIAGNOSIS IN THIS SECTION)

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN CLEARANCE LIGHT
CONNECTOR TERMINALS 1  B-5  (1  B-74  ) AND  B-7

YES

•

TURN THE LIGHTING SWITCH TO 

OR 

POSITION

•

IS THERE BATTERY VOLTAGE APPLIED TO
CLEARANCE LIGHT CONNECTOR 4  B-5  (4  B-74  ) AND
GROUND?

YES

NO

NO

GROUND IT SECURELY

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
FUSE  F-7  (10A) AND 4  B-5  (4  B-74  )

N8A0160E

8-178 CAB AND CHASSIS ELECTRICAL

2. Clearance Light on the Left (or Right) Side Inoperative

Notice:
Figure in parenthesis “( )” indicates place of inspection for clearance light on the right side.

•

IS THE CLEARANCE LIGHT BULB ON THE LEFT (OR
RIGHT) SIDE NORMAL?

•

IS THERE ANY CONTINUITY BETWEEN THE

YES

NO

REPLACE THE BULB

•

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN 
1  B-5  (1  B-74  ) AND  B-7

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN THE
CIRCUIT

HARNESS SIDE CONNECTOR 5  X-15  (12V), 5  X-4  (24V
AND NKR77 FOR TAIWAN) AND 4  B-5  (OR 4  B-74  )?  

N8A0161E

CAB AND CHASSIS ELECTRICAL 8-179

3. Both Taillights Inoperative

• IS FUSE  F-7  (10A) NORMAL?

• IS  J-9  SECURELY GROUNDED?

YES

REPLACE THE FUSE

• IS THE TAIL RELAY NORMAL?

YES

GROUND IT SECURELY

YES

REPLACE THE RELAY

• IS THE LIGHTING SWITCH NORMAL?

• IS THE BATTERY VOLTAGE APPLIED BETWEEN

LIGHTING SWITCH HARNESS SIDE CONNECTOR 
8  B-70  AND THE GROUND?

YES

NO

REPAIR OR REPLACE THE LIGHTING
SWITCH

YES

NO

NO

NO

NO

• TURN THE LIGHTING SWITCH TO 

OR 

POSITION

• IS THERE BATTERY VOLTAGE APPLIED TO 4  H-16

AND GROUND?

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
FUSE  F-7  (10A) AND 8  B-70 

• REPAIR A POOR CONNECTION AT THE CONNECTORS

OR AN OPEN CIRCUIT BETWEEN LIGHTING SWITCH
HARNESS SIDE CONNECTORS 7  H-16  AND  J-9

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
TAILLIGHT RELAY CONNECTORS 5  X-15  (12V), 
5  X-4  (24V AND NKR77 FOR TAIWAN)  AND
4  H-16  

N8A0162E

8-180 CAB AND CHASSIS ELECTRICAL

4. Taillight on the Left (or Right) Side Inoperative

Notice:
Figure in parenthesis “( )” indicates place of inspection for taillight on the right side.

5. License Plate Light Inoperative

• IS TAILLIGHT BULB ON THE LEFT (OR RIGHT) SIDE

NORMAL?

• REPAIR A POOR CONNECTION AT THE CONNECTORS

OR AN OPEN CIRCUIT BETWEEN CONNECTOR
TERMINAL 4  H-16  AND TAILLIGHT CONNECTOR 
1  R-1 ( 1  R-6 )

YES

NO

REPLACE THE BULB

N8A0163E

• ARE BOTH TAILLIGHTS OPERATIVE?

• IS THE LICENSE PLATE LIGHT BULB NORMAL?

YES

NO

TURN THE TAILLIGHTS ON (REFER TO
TAILLIGHT DIAGNOSIS IN THIS SECTION)

YES

NO

REPLACE THE BULB

  IS THERE BATTERY VOLTAGE APPLIED BETWEEN 

5  H-16  AND THE GROUND WHEN TURNING THE
LIGHTING SWITCH ON?

• REPAIR A POOR CONNECTION AT THE CONNECTORS

OR AN OPEN CIRCUIT BETWEEN 1  R-2 OR 1  R-14
AND 7  H-16 

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN THE
CIRCUIT

•

N8A0164E