Tractor, I agree with most below (not sure about Jims coil ohms values??) so will just take your specific questions:
Q I dont know what all could happen.
A If its a 12 volt tractor and you use ONLY a 6 volt coil with no external series voltage dropping (12 to 6) Ballast Resistor, it will run fine for a while buttttttt the coil may get so hot you cant hold your hand on it and/or the points will burn up prematurely.
Q I dont think the coil is a 12 volt coil. Being it is 12 volt, it needs a resistor on the coil, right?
A RIGHT otherwise see the above
Theres so many different coils out there but my general best guess answer is to measure the coils primary ohms resistance between its lil + and - terminals with a good ohm meter on the low R x 1 scale and if its around 1.25 to 2 ohms its a 6 volt coil but if more like 2.5 to 3.5 ohms its a 12 volt coil or else as posted below if it smells hot after some time or you cant touch it, probably a 6 volt coil (needs external ballast)
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