I havnt looked at back woods home magazine online for a while ( WELL worth reading) and when I pulled it up , there was a great article on a homemade 12v generator. Not very deep or technical, but enough to get the idea.
Enjoy.
http://www.backwoodshome.com/articles2/vansant131.html
Les
Enjoy.
http://www.backwoodshome.com/articles2/vansant131.html
Les