I'll have to check my H but I'm pretty sure that the words "internally ballasted" are silk screened on the coil. It was purchased from Tractor Supply.
That, to me, says that at least some 12V coils do have resistors in them. From a production standpoint, it's certainly more efficient to have the coil winder doing one thing, than having to operate/maintain two coil winders, or switch the one you have back and forth between winding 6V and 12V coils.
Most of that big white chunk on a ballast resistor is ceramic material. The actual resistor is not very large, and could be tucked into the middle of the coil quite easily.
Anybody know why they encase the resistor in ceramic? Ceramic is normally not a good heat sink, and is awfully brittle to call it protection.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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