noise through radio?

does anyone know if this is caused by a bad alternator? when my car is running and i rev the motor i hear the revving through the radio. thanks

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Bad alternator or diode therein is a good candidate. Other possibility is ignition noise from old cables.
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or bad grounding. it could be that your speakers are the radio's source of grounding.
wrote:

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Year/make/model
Glenn
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wrote:

And whether the noise always present, or it's something that cropped up?
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it's a 1998 dodge avenger and said it happens more once the car warms up .thanks for the replies

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