With no power applied, you might remove the cover on the voltage regulator
and make sure the points are making contact. Also there is a fusible link
and a resistor on the bottom of the regulator. The fusible link usually has
a piece of "spaghetti" around it that will appear burned if the link has
wiped out. I have replaced the fusible link with a piece of fairly fine
wire and gotten by for a long time. If the resistor is broken you're probably
stuck.

If the regulator is OK (it usually is) it may be the generator which is easy
to fix if you catch it soon enough, before the windings get in contact with
the armature, etc. They are really pretty simple. I've got some glass tape
I use to replace the rotten stuff on the field windings - it works pretty
good. E-mail me if you get in a scrape for this commodity.
--
George Downs, Bartlesville, Oklahoma, Central US