HEADLAMP SWITCH
The headlamp switch is located on the upper left
side of the instrument panel. Refer to Group 8E,
Instrument Panel and Systems, for proper service
procedures.
HIGH-BEAM HEADLAMP SWITCH
The high beam headlamp switch is part of the
multi-function switch located on the steering column.
Refer to Group 8J, Turn Signals and Warning Flash-
ers, for proper service procedures.
HEADLAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS ARE DIM
WITH ENGINE IDLING OR
IGNITION TURNED OFF
1. Loose or corroded battery cables. 1. Clean and secure battery cable clamps
and posts.
2. Loose or worn generator drive belt. 2. Adjust or replace generator drive belt.
3. Charging system output too low. 3. Test and repair charging system, refer
to Group 8A, Battery
4. Battery has insufficient charge. 4. Test battery state-of-charge, refer to
Group 8A, Battery.
5. Battery is sulfated or shorted. 5. Load test battery, refer to Group 8A,
Battery.
6. Poor lighting circuit Z1 ground. 6. Test for voltage drop across Z1 ground
locations, refer to Group 8W, Wiring
Diagrams.
7. Both headlamp bulbs defective. 7. Replace both headlamp bulbs.
HEADLAMP BULBS BURN
OUT FREQUENTLY
1. Charging system output too high. 1. Test and repair charging system, refer
to Group 8A, Battery.
2. Loose or corroded terminals or
splices in circuit.
2. Inspect and repair all connectors and
splices, refer to Group 8W, Wiring
Diagrams.
HEADLAMPS ARE DIM
WITH ENGINE RUNNING
ABOVE IDLE
1. Charging system output too low. 1. Test and repair charging system, refer
to Group 8A, Battery.
2. Poor lighting circuit Z1 ground. 2. Test for voltage drop across Z1 ground
locations, refer to Group 8W, Wiring
Diagrams.
3. High resistance in headlamp
circuit.
3. Test amperage draw of headlamp
circuit.
4. Both headlamp bulbs defective. 4. Replace both headlamp bulbs.
8L - 4 LAMPS LH
DIAGNOSIS AND TESTING (Continued)