One thing that will cause a teg to eat alternators, (although, two days is insane, that was definitely either a bad alternator or a wiring problem) is something I found out the hard way.

If you play around a lot under the hood or with the works around the drivers side wheel, you may have removed one of the plastic splash shields either under the car or in the drivers side wheel well. (I removed mine because it was broken .. thinking ..eh... I'll replace it when I get around to it).

Removing the one beneath the engine near the drivers side wheel well caused a great deal of water to splash up on the alternator if I hit puddles or I was driving during rain. This caused me to run through three alternators in a year before I found out what the problem was.

Just a thought.