vonguinness,

There is no system that will allow you to remove a generator, replace it with any kind of alternator and hook the same wires back up. The components are different, and the wiring arrangement is different. Your battery won't charge because the charging system components aren't compatible and will not function together.

It isn't unlikely that you have ruined the alternator. The electrical forum has lots of info on swapping to a alternator. Use the search function in that forum using appropriate terms and see what info you can glean, then come back and ask questions. Good luck!

Stuart