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alternator high pitch noise

nick88

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hey guys, just a quick query, i noticed today that my alternator would made a high pitch whine/noise(kind of like that mosquito ringtone that only over 22 yr olds can hear:p), but it would only happen with the key tuened to On, with out the keys in i couldnt hear anything, and with the engine running i dont think i could hear anything either, but ill clarify that one tomorrow...
just wondering if its of any concern or anything?

thankz
Nick
 

NeilB

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Check the Belt.
 

Jamie_87

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When i turn my key to on , i hear the fuel pump go then i can hear the sound u talking about in my engine bay,i always thought it was the fuel getting pressurised on the rails or iacv opening or something, dnt think the alt makes noise unless its spinning.
 

nick88

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yea you could b right, i just thought it sounded like it was comming from the alternator bcause thats where it 'sounded' the loudest... so ur right it could b the fuel bein pressurised or the iac valve

Nick
 

yZoH

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It is from the alternator....

Turn ur ignition to on & disconnect the plug at the top of the alternator.. the high pitched whine should dissapear, It means your alternator is dieing pretty much.

Cheers
MaT
 
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