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the KEY source it can be the blue wire ( brown in 70 and lates ) going from ballast to coil.

Or if thinking on remove ballast resistor, then use the blue wire ( all years ) originally feeding ballast and regulator

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when I made this quote it was because forgot to add ( twice ), if removing ballast, NEED to splice together brown and blue wires coming from bulkhead to hook there the small red wire of MSD. If not remove the ballast wire going originally to coil is simply enough. Its just a trigger to turn it on, not a power source

Noises on system are actually produced from COIL on stock system, breaker points &/or mechanical regulators, not really the alt, but whatever! Follow the instructions going to batt or starter relay stud. Just take in mind SOME of the ammeter reading can it be some mismatched with the real status