If I was faced with spending that kind of dough, I'd switch to an AC generator as well. As it is, All of my vehicles with dc generators just keep working. The one in the Cadillac was rebuilt about 5 years ago along with Ol'Roy's. Those rebuilds/repairs cost about $100 each.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)