you left alot of important stuff out.. like 'what' ford tractor.
if this is a ford with a sidemount dizzy.. say.. everything from 51 thru 64.. and you are on 12v.. I'd get a Napa IC14SB coil, and use no resistors.
if this is a front mount N.. then you have some options.
use the newer 12v coils AND the oem dash mounted ballast resistor.. or use the old 6v coil, oem dash resistor, PLUS the new resistor that comes with the kit.
yes the resistor gets warm, it is disipating heat ( wattage ) hot enough to ignite something? maybee I guess.
spark potential at the spark plug is mostly a function of air gap and atmospheric pressure and the specific atmospher in the combustion chamber. for all intents and purposes, a 6v coil and 12v coil both make more than sufficient high voltage to jump the .025 air gap under engine compression pressure.
if it's a side mount.. I prefer the 12v napa coil and no resistor.
if it's a post 65 3 cyl gasser.. it's 12v anyways with a 6v coil and a resistor wire setup ..
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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