Alternator help please

[theevilstickboy]

About two weeks ago I just installed a brand new aloternater but what I've noticed is that it makes a weird wissing noice when I use the lights and stuff. Ive never heard a car do that. I need to rev up my car when I stop or the car starts shaking and the lights dim. help me out please.

[maxassassin]

i dont think u installed it right. i think u need ot recheck to make sure stuff is tightened properly and thats your belt has good tension. becuase this being loose will cause the flapping of the alternator.

[adaly86]

Yea my car does that aswell, when it idles it shakes a little with the lights on or fan. The garages here say its normal because it isnt cutting out and its charging fine at 13.5V. Thats at 900rpm idle since i got the carb redone but you could always just bring it up a little, the garages say it doesnt really matter what you idle it at as long as it isnt over revving