Hi Frank
Page 5.1.01 in technicalities show a wiring diagram for a circa 1930 model.
Your dynamo should be a “three brush, incorporating a cut out relay.
Dynamo plus should be connected to “Lightning & charging switch +D” (yellow wire) and to the Ammeter, the other side of the ammeter is to be connected to battery +.
I would guess 25w in front and 5w in the back is what you can manege.
Best wishes
Jan B
