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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

Asked by for the 1997 Lincoln Town Car
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.