Q: What and where should I check? on 2002 Jaguar Vanden Plas

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Getting a battery not charging warning periodically.Drained the battery once and then went away again.
(2) Answers
should be looking at alternator. sounds like its failing(either that or the battery has hit its life span). get diagnostic run to confirm or dismiss. tech. will advise.
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