High frequency noise from remanufactured alternator

[JB0702]

Hi,

I have purchased a remanufactured alternator for my fiesta. I just got the alternator and I realised that when I turn the pully, it’s making really high pitch noise. The noise is not loud but I can tell it is definitely there. I asked my dad and he said he can’t hear but my siblings saying that they can hear it.

Is it normal to hear a whiny high pitch noise? It is coming from both directions although anti clock wise is not as loud as clock wise. All parts in the alternator looks intact and good.
I have recorded the noise and here is a link.

youtube.com/shorts/H3Z5wwYSAYo?feature=share

youtube.com/shorts/Xqr_oxvEUOw?feature=share

[GreenV8S]

It's got bearings, seals and brushes in it. It won't be silent. I can't hear any unusual noises in that video but if it's not obvious enough for your dad to hear it and it spins smoothly I suggest you stop worrying about it.

[JB0702]

GreenV8S said:

It's got bearings, seals and brushes in it. It won't be silent. I can't hear any unusual noises in that video but if it's not obvious enough for your dad to hear it and it spins smoothly I suggest you stop worrying about it.

Okay, I thought my dad couldn’t hear it as the sound is very high frequency and people can’t hear that range of sound after certain age. But the alternator is turning freely so I guess I will give it a go and see how it works on a car. Thank you!