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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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