kholer marine generator

I have a Kohler marine generator, serial 240957-2 with kohler controller no. D-245546. Does anyone have a manual or schmatic or better yet the controller itself? I think it is a 1962 generator but do not know the rating. It quit working, for no apparent reason. I think it may be dirty slip rings or commutator(it has both). The commutator is part of the starting and charging circuit,and may be part of the field circuit. I cant quite tell. Or the problem may be in the voltage regulator(if I can find it in the controller)I think the relays in the controller are 24vdc, but are not sure. Can any body help me?