@Owen: No, this was not a one-wire, I said it ACTED like one. As I said previously, it's your usual Delco 10si, THREE WIRE alternator. I was not, however, aware that the alternator should not put out power in the absence of voltage on the sense lead... further proof that the first alternator in question was truly FUBAR, as it was indeed doing some overvoltage damage. Thanks for that info!
@JohnT: Thanks for the info re: idiot light (and resistor) vs. diode, I'll go that way instead. I've been meaning to go to the electric bits store to pick up a project box anyway, into which I can put an ignition switch and a few gauges (voltage, etc). I'll put the light and resistor in there.
Also, thanks for the suggestion of testing the coil- being rated for 12v doesn't mean much if it's still burning points! I'll check that out today.
Thanks to all for your help! I've got an alternator rebuild kit on the way, as well as the condenser, wires, and some other stuff. I'll try to remember to let you all know how it goes once it all gets here.
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