Thank you Rick, Frank and Phil,
I have brought the generator to a specialist. The cut out relay is good after all. Apparently, the field windings are the culprit. And apparently these may be difficult to find, so for this summer, I will charge the battery after every outing and will make sure that I don't excedd 100 miles per outing. In the fall, I will then tackle the problem one way or another. I own 1931 model 414 as a parts car. Even though the generator is different, would anyone know if the field windings would be interchangeable between the two?