My '51 generator is not charging.

I have 2 posts on my generator. With truck running, both posts at generator have 0 Volts when checking to ground.

My voltage regulator has 5.5V at the left terminal, 0V on the right and middle. I believe the right post is the F terminal, and the middle should be the B+ coming off of the generator?

Thanks in advance,
Keith


1951 3600 Chevrolet