Things to check. Do you have motor field from the rectifier? If the Genny is spinning and you have Generator self-excited field current, you should have voltage at the generator brushes, to the motor brushes, and if you do the motor will turn. This is all predicated on the Genny being wired correctly. As elmcannic stated, when you get it running compounding is critical. It should run the same speed up and down in leveling with a balanced load. Generators are complicated. Brushes need to be seated, the series field needs to be correct. Some Otis units had separate fields for leveling. this is something to check as the leveling field was put into play with a contact from one of the speed switches, like FE or 1E. Good Luck.
