Dodge RAM TRUCK 1500 1995 Service Manual page 486

B R — — — • —^ * — — _ _ _ _ _ _ LAMPS 8L - 3
FOG LAMP DIAGNOSIS
CONDITION
P O S S I B L E CAUSES CORRECTION
FOG LAMPS A R E DIM
WITH ENGINE IDLING
OR IGNITION TURNED
OFF.
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 Z1-ground.
7. Both fog lamp bulbs
defective.
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 Z1-ground locations,
refer to Group 8W.
7. Replace both lamp bulbs.
FOG LAMP
BULBS BURN OUT
FREQUENTLY.
1. Charging system output
too high.
2. Loose or corroded terminals
or splices in circuit.
1. Test and repair charging system, refer to Group 8A.
2. Inspect and repair all connectors and splices, refer to
Group 8W.
FOG LAMPS A R E DIM
WITH ENGINE
RUNNING ABOVE IDLE.
1. Charging system output
too low.
2. Poor fog lamp circuit
ground.
3. High resistance in fog
lamp circuit.
4. Both fog lamp bulbs
defective.
1. Test and repair charging system, refer to Group 8A.
2. Test voltage drop across Z1-ground, refer to Group 8W.
3. Test amperage draw of fog lamp circuit.
4. Replace both fog lamp bulbs.
FOG LAMPS FLASH
RANDOMLY.
1. Poor fog lamp
circuit ground.
2. High resistance in fog
lamp circuit.
3. Faulty fog lamp switch
circuit breaker.
4. Loose or corroded terminals
or splices in circuit.
1. Repair circuit ground, refer to Group 8W.
2. Test amperage draw of fog lamp circuit.
3. Replace fog lamp switch.
4. Repair connector terminals or splices, refer to Group 8W.
FOG LAMPS DO
NOT ILLUMINATE.
1. Blown fuse for fog lamps.
2. No ground at fog lamps.
3. Faulty fog lamp switch.
4. Broken connector terminal
or wire splice in fog
lamp circuit.
1. Replace fuse, refer to group 8W.
2. Repair circuit ground, refer to Group 8W.
3. Replace fog lamp switch.
4. Repair connector terminal or wire splices.
J958L-12