I cleaned up some of the parts today, and did a few test with
the ohm meter.
All the commutator sectors are good, i.e., none show “open”.
I have continuity through each field coil.
I tried testing the rheostat, but didn’t know what I was doing,
but I got all kinds of “whacky” readings with my auto sensing
ohm meter. My old analog was stable, but I still had no idea
what I was doing.
Some of the internal wiring must be missing, as there’s no
way for current to get from the rheostat to the field coils.
There was a long “hot” wire with an alligator clip to hook
on the battery “positive”, I presume, going to the rheostat
terminal, but nothing from the rheostat to the field coils.
I also thought that one of the two commutator brushes
should be grounded to the frame, but they both seem
to be insulated from it.
I still haven’t figured out where the battery ground connection
may have been hooked up to this motor.
Prepare to be boarded!