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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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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