Dodge 2000 DURANGO Service Manual page 404

8L - 2 LAMPS
DIAGNOSIS AND TESTING
SYSTEM DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING
SYSTEM DIAGNOSIS
A good ground is necessary for proper lighting
operation. Grounding is provided by the lamp socket
HEADLAMP
CONDITION
HEADLAMPS ARE DIM
WITH ENGINE IDLING
OR IGNITION TURNED
OFF
HEADLAMP BULBS BURN
OUT
FREQUENTLY
HEADLAMPS ARE DIM
WITH ENGINE RUNNING
ABOVE IDLE*
HEADLAMPS FLASH
RANDOMLY
LAMP DIAGNOSIS
TABLE OF CONTENTS
page
POSSIBLE CAUSES
1. Loose or corroded battery cables.
2. Loose or worn generator drive
belt.
3. Charging system output too low.
4. Battery has insufficient charge.
5. Battery is sulfated or shorted.
6. Poor lighting circuit Z3-ground.
7. Both headlamp bulbs defective.
1. Charging system output too high.
2. Loose or corroded terminals or
splices in circuit.
1. Charging system output too low.
2. Poor lighting circuit Z3-ground.
3. High resistance in headlamp
circuit.
4. Both headlamp bulbs defective.
1. Poor lighting circuit Z3-ground.
2. High resistance in headlamp
circuit.
3. Loose or corroded terminals or
splices in circuit.
when it comes in contact with the metal body, or
through a separate ground wire.
Always begin any diagnosis by testing all of the
fuses and circuit breakers in the system. Refer to
Group 8W, Wiring Diagrams.
1. Clean and secure battery cable clamps
and posts.
2. Adjust or replace generator drive belt.
3. Test and repair charging system, refer to
Group 8A,
4. Test battery state-of -charge
, refer to Group 8A.
5. Load test battery, refer to Group 8A.
6. Test for voltage drop across Z3-ground
locations, refer to Group 8W.
7. Replace both headlamp bulbs.
1. Test and repair charging system, refer to
Group 8A.
2. Inspect and repair all connectors and
splices, refer to Group 8W.
1. Test and repair charging system, refer to
Group 8A.
2. Test for voltage drop across Z3-ground
locations, refer to Group 8W.
3. Test amperage draw of headlamp circuit.
4. Replace both headlamp bulbs.
1. Test for voltage drop across Z3-ground
locations, refer to Group 8W.
2. Test amperage draw of headlamp circuit.
3. Inspect and repair all connectors and
splices, refer to Group 8W.
CORRECTION
DN