Charging voltage question?

Uuuhhh.... no, not this much. There is some drop as the alternator's diodes and windings heat up, but not 1 to 1.3 volts.

Had a chance to get out again today and this time the voltage remained high. It was between 14.7 and 15.1, I stopped every once in a while and checked the voltage at the battery just to verify. Every once in a while it would drop to @ 13.6 or so just for a minute or so and then back up. I'm starting to think maybe time to change the VR and see if that helps, any suggestions ??