Chrysler Repair: Car wont start, chrysler town, alternator

Question
I have a 1998 Chrysler Town & County minivan, 3.8 litre.  I have replaced the starter, which was not the problem.  As of now, the vehicle will not start.  The (new) battery drains after driving for only a little while (less than 2 miles).  I have lights, radio and so forth when the battery is completly charged but the battery will not stay charged.  The alternator has been tested and according to the read-out is working properly.  All fuses have been checked and the wiring as well.  I am at a total loss.  I am hoping it is something you can help with.

Answer
hello kassia
it is only one thing to do pull the pos cable while the car is runing if it dies then it is the chargeing system then i would put a new alt on it or a vottalge reg that is in the compuiter . good luck to u hun and u have a pretty name and if u need more help i will be here pete