trouble keeping a van running!?

Question

I drive a 1995 Pontiac Trans Port, and in the past 3 months, have had to put 3 alternators into it, and now the 3rd one has just gone as well.
When it is running, it runs great, but I can't seem to keep it running for very long. And I honestly don't think that it's the alternators that are the problem, because I have changed them.
What could be making them blow like that, and how can I get it fixed!

THANX!

Answer 1

Loose, dirty, or corroded battery connections.

Answer 2

A short somewhere in the system or a bad battery.