[Pat/Ohio]

If you have a stock generator...it has a third brush built in that is adjustable. Remove the band around the generator and it should be the brush that is facing you. "Push" it with a screw driver one or way or the other and then start the car and see if there is any difference in the reading. If it is showing more of a discharge, turn the car "off" and adjust the brush in the other direction. Start the car again and see if the ammeter is charging more this time. If there is no difference the readings...you may have a generator problem or a wiring problem.
Good luck, Pat