The way I remember--from reading, not from doing--is to jump a couple of terminals on the voltage regulator. You're basically using battery current (electromagnet) to re-magnetize the iron of the generator. It has to have some residual magnetism to begin charging. Once it starts to charge, it self-magnetizes the generator. Leave the generator long enough, and there's no residual magnetism, and it won't begin charging.
I'll have to look that up in the Delco 1.2 manual.
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