Rewinding AC Generator Alternators

get a job in a motor rewind shop. look for publications in a large central refenece library, such as New York or London and borrow via interlibrary loan if you can. book are scarce on this

Rewinding alternators etc requires craftsman's art as well as electrical knowledge, there is lots of info on the net, but as others have said try to find work in the industry.

After that invest in many kilos of copper wire, insulating varnish , temperature controlled oven and winding machine and lots of patience. Good luck

A friend did a 4 year apprenticeshiip as an electrical armitige winder. Good luck doing this in your spare time.