Any past or current owners experience a "WHISTLING" sound from behind the dash which varies in frequency.Loudest with high electrical load i.e. headlights,rear de-fogger,
heater etc.Sound varies with alternator speed.
Tweak to subject line
Edited by Pugugly {P} on 05/10/2007 at 22:39
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Alternators can become electricaly noisey when they develop a fault in the windings etc, it could still be charging but best to put on a lab scope to check the wave form if you can find someone with a scope who knows how to read it. Also check all the connections & test the battery. sometimes a battery that has a dead cell will make the alternator generate a lot of noise. I have also had cars where a battery has been touched or jumped the wrong way round & caused diode damage to make an alternator whine loudley & get noiseier with the more load put on it.
Doc
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Thanks for your interest Injection Doc .......Noise not coming directly from Alternator....more like behind r/h dash. Sound audible on using starter,then not noticeable until load is turned on......headlights,demister etc. Any further ideas?.
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is it possible its coming from the headlamp warning donger , you know when you have left the lights on & its picking up RF from something like the old radio's used to do?
Doc
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Problem solved.....see seperate thread - faulty radio/speakers.Solved this (drivers door speaker was faulty knocking out all speakers!).The sound was coming from the tweeter paralled with the duff speaker!.Thanks for suggestions.
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