Hi Scott, good luck with it & please keep us informed as ya go.
You did say it's reading 14.3v at tickover, mine is approx. 13.5v at tickover & approx. 14.5v at 3,000rpm. I would check it at 3krpm, if it's 15v + could be as Tim mentioned. Don't try & start it with a low battery, Triumph sprags don't like that.