Quote Originally Posted by Jaimecbr900
That's usually a bad diode in the alternator.

Go to any auto parts store like Autozone or Pep Boys and they will check it for you for free.
yea well i got the battery tested at autozone today and it is fine, to get the alternator tested dont i have to take it out of the car?

also new info, when it was dark i found out that when the battery light turns on the all of the lights get brighter, i will check the ground first thing tomorrow morning.