I don't see exciting an alternator is the same as polarizing a generator. An alternator needs excitation power supplied to it for it to start charging. A properly functioning generator and regulator set up will start charging from the residual magnetism in the generator, it does not need to be excited by outside power. Polarizing basically sets the direction of current flow from the generator to match the vehicle system, since it can charge either positive or negative systems. An alternator has diodes, so the flow is only the direction the diodes allow, not convertible by simple polarization.
To me having to continually polarize a generator after a battery has been unhooked indicates a problem(s) with the generator and/or regulator. I have pull started vehicles with generators, having a dead or no battery in them, by getting them turning over fast enough that the generator starts charging enough to power the ignition.
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