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A bad alternator or charging system will leave the battery low lights dim, should have the no charging indicator light on the dash and the car will eventually stop running as the battery looses its charge. Maybe you can tell us your problem and we can give you some mor info.
Battery Light usually means the alternator is not charging correctly and needs to be replaced. Check charging volts, it should at 14 volts or very close to that number. If the number is low below 12 then the alternator needs to be replaced.
Note: A bad alternator can damage the battery & vise versa
You would need to check the connections on the back of the alternator with a meter. You should have battery voltage on the large wire and on the orange yellow wire. The other two wires involve the engine computer which turns the alternator on after the engine starts.
Check to ensure that the belt is tight. Sometimes the tensioner for the serpentine belt sticks and doesn't properly tension the belt. Usually there's a square hole in the tensioner that one can place a breaker bar into to gain leverage to move the tensioner.
Check for damaged or corroded wires on alternator. Also check connection to alternator, take off and clean. Alternator may be on it's way out. You might want to get it tested at garage or replace if problem persists.