There are 4 pole, 6 pole, 8 pole, 11 pole, and I've heard of a 12 pole (rare).
The 6 and 8 are interchangeable. The 11 pole is a common upgrade for us guys with buggies running lights and winches. It does require rewiring or an adaptor, it is not a direct plug and play.
The difference is the more poles the more amps it produces. The drawback is it also creates more parasitic drag on the engine.
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