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The OP needs to find a friend with a growler so that the armature can be properly tested. Check the ohm readings on the field coils. Make sure wiring or terminals are properly insulated.
Motoring by itself is not always a good indication that the components are all good to go. Polarizing or flashing the field with a DC current should give the pole shoes a good magnetic gauss. If there is no residual magnetism then the generator won't put out enough current to close the cut out switch.