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I took my 08' FJ into the dealer for routine oil change and they called me back to inform me my alternator is making noise and they believe it's a bearing. $531 to replace it! How hard is it to replace myself? Anyone else done this? Where would be a good place to purchase the replacement alternator? thanks in advance guys.
 

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Easy to do. What makes them think its bad? Did they remove the belt and spin it ? How many miles on it?
 

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Easy to do. What makes them think its bad? Did they remove the belt and spin it ? How many miles on it?
Unplug the electrical connection and the sound should go away, plug it back in and the sound comes back.
 

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(Thread resurrection from 5 years ago, but ...)

"Unplug the electrical connection and the sound should go away, plug it back in and the sound comes back."

If a bearing was physically bad (noisy) due to wear, corrosion, etc., mating or de-mating the electrical connector would not change any bearing-related noise.
 

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If you have a winding noise while driving, especially when beginning to accelerate, your bearings on your alternator are probably starting to go. Good old fashioned method is to place a large screwdriver on the pulley bolt and listen on one ear like a stethoscope. This works on nearly all pulleys.
 
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