1995 Mercedes Benz SL500 • V8 2WD Automatic • 900,000 miles

My wife has a 95 sl 500 mercedes benz. When she turns her head lights on a noise sounds goes off that sounds like loud humming sound or a motor. This only happens when the lights are on. Can you tell me whar's causung this noise and how much it would cost to repair the problem? By the way, all of her lights are working.

Thanks for your help,

Steve Tadlock
January 3, 2011.

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