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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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