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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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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