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 - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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