bjernigan

Check out the video and let me know if you have any ideas.
I installed the 145A alternator and now I'm getting a strange new noise that sounds like I installed a super charger. The noise doesn't seem to be coming from any pulley in particular -. I spun all the pullies by hand and didn't notice anything funny. I also inspected the belt and didn't see anything funny - looks good. I've also attached a photo of how far the tensioner is stretched for reference - in case there's something funny there.

99Bluz28

iTrader: (35)

Did you double check and make sure you routed the belt correctly, are the mount bolts tight, and is the belt new?

bjernigan

Yup, reinstalled the belt to make sure - but I don't think you could put this belt on wrong. Bolts are all tight. Same belt as before.

01 ss vert

iTrader: (1)

Pulleys can whine even without any play/slop in the bearing. I can't play the video at work, but I'm 98% certain that is your issue.

666ws6

iTrader: (3)

I have a similar sound... I installed a bigger alt and it does sound sort of like a blower. But seems ok to me.

99Bluz28

iTrader: (35)

When I had a Power Master 200amp alt on my car it always made a whirling sound, like a turbo spooling up. It did this since the day I first installed it up until the time it went out years later.
BTW it's possible to route the belt wrong around the idler pulley on the driver side and still have it run normally. Does your belt after it goes around the alt pulley go straight back up and over the idler pulley then down and around the crank pulley?

Here's the correct belt routing:
https://ls1tech.com/forums/attachmen...lt-routing.gif

LS1vazquez

I would recheck the electrical cables going from the positive battery terminal to your three contact points and make sure you have a good contact. I dealt with the "supercharger" whine after I installed my alternator and it ended up being a bad contact with the negative terminal.

senicalj4579

iTrader: (41)

I really dont understand how anyone could route this belt the wrong way.
On a side note I have a powermaster and it dosent whine but it has an annoying loud chirping.

How about the air pump? Could the air pump have something to do with the noise?

99Bluz28

iTrader: (35)

Believe me I didn't either, but a couple months after getting my car back from a warranty repair back in 2000 I happened to look at the way the belt was routed. It was routed from the WP down and around the idler pulley then up and around the PS pulley, and from the Alt pulley straight to the Crank pulley.
Easy way to see if the air pump is causing it, pull the fuse.