Niuzie bro

A rule of the thumb is always check that the speed is correct before adjusting the voltage

Have you any photos of the diodes on the bridge rectifier

Mooi om te zien! Ik heb deze haspel nu in mijn bezit! Gereviseerd en draait nu op een vaste elektrische Stork pomp

I have a problem with my bkb generator on a lister st1. Do yiou now if there are any drawings or manuals of the bkb generators?

Interesting that you had to cut out all of the field resistance to get the voltage up. Have you verified that the speed is correct? Low speed equals low voltage on this type of generator.