Im still looking for a miller alternator in any condition or better still just a empty case. that I can convert to 12 volt. there must be one out there somewhere thank you.
My Brum case has a Lucas RM19, three wire alternator and could be used as a 12v but I wired it as original 6v. I think you would want to use the least powerful alternator because of the flimsy drive. I posted the build somewhere on hear.