You should do a seach on alternators. I am no mecanic but from what I have read on this forum it sounds like that alternator is not fully charging the battery. If you do a search you can find the correct values of cahrge and so forth. Or pull the altonator and ahve it checked at a local car supply store. Could be the voltage regulator....

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Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)