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Hi Johan,
I'm guessing that you start the organ up as usual, but when you switch to
run the generator stops? Looking at the diagrams there appears to be two
windings on the run motor, one is brought out to a pair of red wires, the
other to a pair of black (or blue, the diagram shows blue in brackets as an
alternative). It would be interesting to disconnect the wires at one end
and measure the resistance of each winding, I would expect them to be about
the same. If the converter damaged one winding when it died you may find a
very different resistance on the two windings. It is possible, depending on
the design of the converter that when it died it fed DC voltage to the
motor, which may have damaged the motor.
The only other thing I can think of is that if during installation of the
new converter you removed all the wires to the motor from the terminal
strip, (I can't see that you would need to do this, just considering
possibilities). If one pair of wires e.g. the reds were reversed when
reconnecting this would reverse the direction of rotation of the motor,
which would be quite interesting to say the least when the starter spins it
in the original direction. I don't think this is likely however, I'm just
mentioning it as a possibility.

When acting on technical advice given in the Hammond zone, by me or anyone
else, please remember that there is high voltage electricity inside Hammond
organs and Leslie speakers. It is not just the AC line voltage, valve
(tube) equipment uses high DC voltages which may remain for sometime after
switching off.
Take care and enjoy your Hammond for many years.

Chris Clifton