I think xtreme makes a great product. They are the unofficial recommended replacement for PTO's on this site.
I think you have a different problem.
I'm willing to bet that you have a poor connection somewhere that is causing an issue. 14.5V on the charging system itself has nothing to do with the 25A fuse blowing. 25 amp is 25 amp. Doesn't matter if the voltage is 12 or 14.5, that fuse will only blow if a load larger than 25 amp is on that circuit. Now, if there is a short, or a poor connection, or a failing component, that can blow the fuse. I'm betting the PTO is getting less than 12v and that's why it keeps failing. Unfortunately, you have to be the one to test and find the source of the issue. Follow the wiring diagram and start from the beginning.
One more thing....If you are measuring the voltage at the PTO by unplugging the connector and testing, that doesn't account for the load. Plug the PTO in, and back probe the connection to see what it reads with the PTO on. I suggest taking the belt off while testing. Better if the engine is running WOT for the test so that you get a max power reading. Either way..... 0.5V over 14v is not likely to be causing an issue. 14.5V is an acceptable charge voltage. However, 39V AC sounds high from the stator. How fast is your engine running at WOT?
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