Okay I just tossed in a 130A right? Well I go to test it and it has a whine to it, similar to a light supercharger.

Is this okay or is my alternator bad? It makes full voltage and stuff as well as no lights are on.

Maybe it has to break in a bit first as it is so new?

Help me with my paranoia...
Eric

 

hate to make it any worse but my gm bought alt is quiet as a mouse.

 

My 200 amp whistles like a supercharger. Very faint but it gets higher as the rpms raise. I think its the nature of the beast. Dont worry till you smell smoke.

 

Well I tossed in my stock 105 and some various tools (3/8 socket set, open ends) as well as the belt just incase something is wrong my *** will NOT be stranded.

Thanks for the input guys!

 

my 130 is quiet too

 

It is caused by the underdrive pulley. It is slowing down the powersteering, which is taking away 2-3 hp. The whistling sound you hear is the 4 way catalytic converters. They do not work well with a HO alternator. Does that sound familiar?