Alternator high frequency noise

Thread Starter

JB0702

Joined Apr 3, 2022
4
Hello,

I am not sure if it’s relatable but I don’t know where to ask so it would be great if anyone can help me. I recently purchased a remanufactured alternator with new brush and bearing and all for my car. I haven’t installed it but when I turn the pully, it is making really high frequency noise. The noise is not constant and seems to be louder when I turn it clockwise. Can anyone help me why it’s making a noise like this? And will it be safe to use on my car?

I have filmed the noise. I played it to my dad but he said he can’t hear anything since he can’t hear high frequency noise due to his age but me and my wife can definitely hear it. One of my friend said he thinks it’s brush and commutator noise. Thank you!

https://youtube.com/shorts/H3Z5wwYSAYo?feature=share
https://youtube.com/shorts/Xqr_oxvEUOw?feature=share
 

ScottWang

Joined Aug 23, 2012
7,202
If you were still worried about the noise, maybe you can make a short recording of around 5 sec sound and upload it to the forum, then our members can do more valuable judgments.
 

Thread Starter

JB0702

Joined Apr 3, 2022
4
If you were still worried about the noise, maybe you can make a short recording of around 5 sec sound and upload it to the forum, then our members can do more valuable judgments.
Hi, I have uploaded the video on YouTube and this is the link below. Thank you!
Video Source.
 
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