Alternator need to be replaced. Bad alternators will cause the battery to over work draining the charge.
You can do a test on it yourself to see if the alternator is bad by starting the vehical and removing the negitive terminal (-). If the vehical continues to run then it is something else if it shuts off its the alternator. You may also want to check your starter as well, it will to drain the battery.
Thursday, July 10th, 2008 AT 11:33 AM