Don't tell anyone, but I have a CS-130 (2-wire GM alt) on my Dart. It puts out more than enough even at idle to run everything electrical with room to spare (headlights, fuel pump, electronic ignition, heater fan, and 40 amps for the Contour fans on full).
Got it for $20 at a swapmeet, figured it was a core, Autozone tested it for free and everything met spec :)
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