So it was instaler error?
Seems to me someone needs to spend more time under the hood of their car.
Also about your belt slip.. How can you feel it in your car? As far as I knew and expieranced belt slip was heard in a high pitched squeal. And if your having that hard of a time finding a belt then change pulley sizes or try to adjust ur alt to where its a tighter pull. And if your that clueless go to wal-mart, get a can of belt dressing and spray that on all your pulleys. David Chartrand swears by that stuff and it helped me as well.