Thanks. That was a good explanation. Even I understood it.
I bought this tractor last Summer but put it aside until a few days ago. Today I noticed that the wiring was inconsistent with that shown in the Owners Manual. So, I re-wired it to make it consistent with the manual. However, when I tried to start it, smoke started coming from the starter terminal. So, I disconnected the battery. About 30 minutes ago, while looking at the manual again, I noticed that it is a positive ground system. Whoever had the tractor before me changed it over to negative ground wiring and connected the battery negative post to ground. I suppose that is why the wiring was inconsistent with the manual. It ran fine as it was wired but the ammeter was bypassed so I couldn't tell if it was charging. Also, the armature terminal of the generator was not connected to anything.
Tomorrow I will connect the postive battery terminal to ground and hope everything works. Thanks again.