To get the motor to run with the e-unit out of thr circuit you need to put power to one brush, connect the other brush to the field lead and the other field lead needs to be grounded. Put the other power lead to ground. It should run. If not first thing I would look for would be a mechanical problem. Worn bearings could be letting the armature hit the stator or brush plate. If it is not mechanical, I would check to see the neither the field or armature windings are grounded somewhere they should not be. Check the commutator to the motor shaft. Lift the field lead from ground and check the field to ground.
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