Is this how you have the wires. Jumper from field to brush.
Then transformer leads .
One to brush.
One to ground.
If this does not do it.. Then some is wrong somewhere.
Commutator might be shorted.
Like was said.
You can switch brush tube wires and it will run other way.
How are brushes and springs.. Brushes move in tube no binding?
Are springs weak?.
