Chrysler Conquest 1988 Service Manual page 247

AUDIO SYSTEM
- Troubleshootinn
8-235
TROUBLESHOOTING
NOISE SOURCES
SOURCE OF ELECTRICAL SYSTEM NOISE
Ignition system
(1) Spark plug
(2) High tension cable
(3) Distributor
Power generation system
(1) Ripple at contact between alternator
armature and carbon brush
(2) Spark from voltage regulator contact
Other electrical device
(1) Armature of wiper, blower and other
motors
(2) Starter and switch when starting
engine
(3) Contact of fuel pump
(4) Spark from changeover switch
(5) Horn
(6) Contact of turn signal
(7) Loose contact of wiring harness
(8) Static electricity generated by tire
or generator V-belt
(9) Electric fuel pump
(10) Voltage stability unit for instrument
NOISE SOURCE OF VEHICLE EQUIPMENT
Kind of noise
Whistling sound
Scratching sound
Jarring
Wish-wash,
wish-wash
Buzz, click
Whinning
Equipment
Symptom of noise generation
Alternator Noise increases when accelerator pedal is depressed and it
subsides soon after engine is stopped.
Coolant temperature
gauge unit
Fuel gauge unit
Noise is produced while engine is running and it persists.-
for a while after engine shutdown.
Noise is produced at sudden acceleration, driving on
rough road or when ignition key is placed to ON.
Oil pressure switch Noise is produced with engine operation and no noise is
made when engine is idling.
Flasher relay
Horn
Noise is produced with operation of turn signal light.
Noise is made when horn button is pressed or released.
Wiper motor Noise is generated with the wiper speed.
Washer motor
' Noise is made when washer is operated.