Installed New Under Drive Pulleys ??

1st...make sure all of your connections are tight. A loose battery cable will eat an alternator. Second, from my experience, you shouldn't have an issue not swapping the alternator pulley as I haven't had one on my car now but I've read where keeping the old pulley can cause the alternator to overrev. There is a way to tell if it is spinning too fast but I can't remember where I saw it at the moment. It is always a good thing to have a 130 amp alternator so if you can get one go ahead.

That said I'm not a big fan of underdrives. I had issues with my old car with alternators. I had to change it about once a year until I removed them but I did a ton of driving...30K miles a year. Just keep that in mind when you get it running again.