tonight i was driving riight. and i noticed my cluster display was kinda dull. i turned off the AC and then it got brighter..so humm.. i put the car in neutural and with the AC on i reved it 3 times...the lights dimmed on the display. i didnt notice a dimming of the headlights...usually the cars lights would be dull when my car would have a low battery. but i also got my small system running...yet the juice from it doesnt seem like its eating up my battery...is it my alternator? my car starts fine though.