My battery light comes on for a few seconds when i start the car and goes off as soon as i press the gas pedal. This happens rarely , maybe once or twice a week. I checked the voltage of the battery without load at idle its at 14v . with load ( lights ,ac, radio) at idle its about 13 v. I changed the battery but light persists. Tension on the alternator belt is fine too. Any ideas what may be the problem?

 

maybe your alternator is going bye bye.......that happene to me and had to change it