Question about Chevrolet Monte Carlo

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When you turn the headlights on, I get a low pitched squeal through the speakers,and when I accelerate the frequency of the sound gets higher in pitch, and does not stop. If the headlights are left on and I turn the dashlights off, the sound is not there.

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Since it happens with the lights and the accelerator,It is the body ground module that is either loose or damaged.

Posted on Feb 01, 2009

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Hi and welcome to FixYa,

Your described concern almost always indicates an alternator issue. More specifically, the regulator. The actual term is "alternator whine" and since it is coupled to the engine by the belt, the pitch would be affected by the RPM. The whine also rides on the DC voltage since the alternator charges the battery and therefore could be heard on the speakers.

A temporary workaround is to install filters/condensers to shunt the whine to ground although in the long run attending to the alternator now may be to your best advantage.

Good luck and thank you for using FixYa.

Posted on Feb 01, 2009

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You have either a bad ground or a bad switch for the dash dimmer since the noise goes away when you fiddle with the switch. thx peyton

Posted on Feb 01, 2009

  • peyton thompson
    peyton thompson Feb 01, 2009

    oops mrscary beat me to it I know our responses are the same so when you rate this soulution pls rate him and not me! sorry peyton


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Welcome to Fixya! You have a Bad Ground Either inside the Dash or the Battery Ground is Loose. It could also be the Switch for the Lights that is Grounded. A Bad Ground will cause the Squelling through the Speakers. Please Rate My Response! Thanks!

Posted on Feb 01, 2009

  • Travis Humphries
    Travis Humphries Feb 01, 2009

    That's Cool Peyton! Thanks for being Nice!

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