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Vinny, most of them will still work, but on some, you will impart slightly less spark energy across the plug gap if wired wrong, due to transfer and possible heat losses and efficiency factors. I once had an electrical article describing this very topic, but cant locate it and am running on old memory cells here lol. The coil(s) have a winding direction and physical orientation intended to maximize mutual magnetic coupling between primary and secondary, and the magnetic field (N and S) is dependant upon the current direction, all of which determines its design and those + and - terminal locations. If its a non internally ballasted coil like most original 6 volt coils and the 12 volt coils designed for an external ballast, I would wire them to correspond with your tractors battery polarity: ie on a pos grnd, battery power to - and + to ground via the distributors points. On a neg grnd, + to battery power and - to ground via the distributor and its points. Clooney and I e mailed each other about this and agreed since we dont know physically where the ballast is located (wired) on those internally ballasted coils, we wouldnt want to change their wirign from its factory location. Hope this helps. God Bless USA Ol John T Nordhoff
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