No such thing as a coil with internal resister they are just made for 12 volts simple as that. That said try this. Hot wire the thing ans then try to start it. If it starts up like it should it most likely has a bypass set up so more volts go to the coil. If it does have a ballast resister it can be hidden where you may not see it also so the by pass could be your problem
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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