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It usually doesn't really make a sound. The alternator charges your battery, so you can find out by using a tool to see how many volts your battery is running on, or... if you have electric locks, the car will die and the locks will start jerking on their own as well as all the other electrical stuff in the car. Your best bet is to buy a brand new alternator (lifetime warranty) over a used one (30 day guarantee)
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Earn +20 ptsQ: What does it sound like when your alternator goes?
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