I have a whining noise in my 2000 Toyota Avalon with 186,000 miles. Along with the slight whining noise, the interior lights, headlight and gauge light also flicker at idle. If I turn on radio or wiper and hold the window switch the lights flicker even more. I'm guessing that these are really early symptoms of alternator failure in future but I can't be too sure, hopefully you guys can tell me in the comments below thanks.

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