So if I am idling, doesnt matter if its hot or cold, I have no headlights on, no radio but my door open so my interior lights are on. The interior light flickers for a quick second every few seconds. Then if I have no lights on inside the car or radio, but have the headlights on, you can see them do the same thing. Sitting there they get bright for a quick second (less than a read second) and that happens every few seconds, 3-5 seconds. Does this sound like a alternator? its a 2005 xls 2.3L with 110k miles on it, so imo its near time to replace it.