Chrysler Repair: Battery discharging, voltage gauge, battery discharge

Question
Just replaced battery in our Town and Country.  Drove 100 miles, battery dead again.  Removed alternator and tested fine putting out 14 volts.  Other suggestions on what may be wrong.

Answer
Hi Cathleen,
I would be believe, if the battery discharge light was not 'on' while you were driving and also if the voltage gauge read normally, then there may well be a short circuit that is drawing excess current from the battery when you aren't driving. If you truly took the alternator out to test it, then it could have been that the drive belt for it was slipping so that it wasn't putting out 14v when you were running it earlier. It has to be one or the other.
This is important: Was the battery immediately dead when you ended the 100 mile drive? Or was it dead when you tried to start it later and if so how much later?
So after you charge the battery look at the gauge and the warning light. If that is ok, then you have a short circuit that is draining the battery. Tell me the year and engine in the vehicle so I can tell you about how to check for a short. Do you have a volt-ohm-milliamp meter you can borrow or buy?
Roland