my b series is having a problem when u start the car the alt. light stays on and is not charging the battery but when you rev the engine a lil bit the light goes out so i guess its charging my question is can my alt. be bad or is there something else that is being overlooked and when it idles back down the light comes on again.....the alt. that was on the car at first was doing this now i purchased a used one that worked and still the same results.....PLEASE HELP!!!!!!!!!