Usually a smooth even RPM when you jump voltage to the ARM post and case/frame (with FLD grounded) means the Armature, Brushes and bearings/bushings are in "decent shape" Then if it increases RPM when FLD is ungrounded that means the Field windings are at least intact. If she dont change RPM at all I question if the Fields are bad such as open or shorted internally. An ohm meter can provide an indication if the fields are open or shorted.
That noise may be a bearing/bushing "going" bad although it isnt bad enough yet to allow the armature to drag.
I prefer a battery for the motor test but still think it should act about the same as above unless the charger can barely supply enough amps to begin with.
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