Can anyone break down how a DC generator with a piggybacked exciter motor works ? I’ve got a 1948 CJ Anderson unit. I have never worked on one with a separate exciter motor. And all the guys a talk to locally don’t seem to actually understand them either, because they are not just telling me how to troubleshoot the brushes , resistors and coils. I just want to know how it actually works. Unit is running fine , we are getting a set of prints approved by the owner , I just would like to know the theory of how it works so when it goes down I know what I’m looking for operation wise.