Ok brush plate is like an O-27 steam loco just upside down, so to speak. Wires the same way. Can you get a continuity reading through the field coil ? Make sure the commutator plates are clean, brushes also. Disconnect the e-unit for now and hook the armature and field in a series like my drawing. If all your windings are OK it should run. Remember to note how the e-unit connects. One side of the field may be grounded so the frame will be the connection point to the transformer. You will have to determine that. j
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