I was ready for the second flight, and discovered no battery charging during warm up. Turned out to be a busted regulator. It seems that my PM alternator is running too fast with the original pully and producing enough voltage to blow some input diodes in the regulator. I did find a crack in the potting, which looked like cause by an overheated component.

I am using a larger pully now. Hope the new regulator will be here soon.

Unfortunately, I was not able to find any information on the operating limits of that Kubota alternator/regulator combination.

 

Richard Sohn
N2071U

http://www.fairpoint.net/~res12/home.html