That alternator is an original delco-tron external mechanical regulaltor type. A 12 SI is near identical to a 10SI. It looks like some one has adapted a regulator right at the field terminals. Interesting. At any rate, I would follow advice of previous posters on alt. Far as coil, if you don't have an ohm meter, I am sure your friend who is checking alt has one, primary on a six volt coil will be less than 2 ohms and a l2 volt will be about 3 or 4 ohms. And no , it will not have any effect on the charging system, only ignition like short life of points if too much current flow or weak spark if not enough current flow through coil due to too much resistance.
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