Question about 1989 Ford Mustang
Check if noise is only present with motor running -
if so, may be radio interference generated by the alternator - check alternator suppressor capacitor is ok.
If noise is present when ignition on but motor not running, the interference is possibly being generated by some other electronic device on the vehicle - disconnect device/s or remove fuses and note effect.
Mobile electronic equipment such as phones/ satnav etc can also generate interference.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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