If you choose to use the external regulator setup, I believe one of the wires to the regulator needs to have a resistor wired in series with it, or the engine will continue to run when the ignition is turned off. It's been a long time since I've done one of those conversions, but I seem to remember that the idiot light circuit will back up enough current to bypass the ignition switch if it's used with an ammeter instead of a "no charge" light. The internal regulator unit works a lot better.
Jerry

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