Ammeter Maxed

I justed tested it. At the battery was 13.3 while running. Increasing the rpm brought it up a little, but it still stayed below 13.5. Once the fan kicked on, it dropped to 12.7 and increasing the rpm didn't change the reading. The ammeter was still reading high and would max out with an rpm increase.
When I installed the alternator and voltage regulator last week, it was reading 14.5 at the battery while idling. With a brand new alternator and regulator, what esle could be causing this?