Well let me start with this...Please include a signature in your profile..This will help to indentify with model , year and trim package of bonneville you have...You can also add your car "state"...ie stock, modified etc..
As for the Alt., are you sure it IS the Alt...you can have it tested for free at AutoZone...BUT our cars ARE notorious for tearing up alt'*..
As far as re-placing it...fairly easy..
Disconnect neg. battery cable...
Remove serp. belt(*) (2 if you are */c)
Disconnect power lead wire from behind alt.
Loosen and remove alt bolts
Thanks about it..
DID I MISS ANYTHING GUYS!!! (WILL)