Thanks for the reply Joop.
The 10si is good old analog work horse but never looked right to me. A Lester #12190 is a very small Nippon Denso alt. They can be made one wire. The 12190 is 30 amps and 45 amps is available.
Here is a link to the alternator. They are not expensive.
http://www.fleetalternatorstarter.co...ail/121794.jpg