Charging voltage question?

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 ??
I would be going through all of the systems connections with a fine toothed comb, and cleaning them first. That includes all ground connections, bulkhead connections, and ignition switch connections.