battery not charging on 1997 Lincoln Town Car

I had my battery fail although not even a year old replaced the alternator and the battery failed again so I replaced the battery after I start the car the alternator starts charging but as soon as I drive it fails and the car runs off the battery kkilling it

by in Oakdale, CT on January 28, 2011
1 answer
ANSWER by , January 28, 2011
Test the voltage output of the alternator. The output should be between 13.5-14.5 volts. Although the alternator was replaced there may be a possibility that it is defective. Also check the battery cables and make sure they are not secure and in good condition.