1C-12 - TROUBLESHOOTING 90-823225--1 1096
Instrumentation Malfunction
Cause Special Information
Faulty wiring, loose or corroded terminals
Faulty key switch Test, as outlined in Section 4D
Faulty gauge Test, as outlined in Section 4D
Faulty sender Test , as outlined in Section 4D
Radio Noise
Cause Special Information
A “popping” noise that will increase with engine
RPM. Noise will stop as soon as engine is
turned off.
Ignition System - wrong spark plugs; cracked
distributor cap; cracked coil tower; leaking spark-
plug wires; moisture on ignition components
“High pitched whine” in the radio Alternator - poor brush contact on the slip rings
A “hissing or crackling” noise when instruments
are jarred with ignition on
Instrumentation - loose connections, or
antennae wire routed too close to instruments
Varying unexplained noises
Accessories - bilge pump, bilge blower; fish find-
er, depth locator; cabin heater motor, etc. Dis-
connect one at a time until noise disappears.
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