Great info jd, as they say "A picture is worth a thousand words" The few I recall seeing (and I mean fewwwwwwww) that I suspected had an internal discrete resistor had a prounounded ring/groove about 1 inch or more down from the top that looked like a seperate compartment. Still in years and having been a used tractor dealer I never ran across anyyyyyy that looked just like your neat picture and would still say the majority of the non ring or non your picture type 12 volt coils (what some call internally ballasted) DO NOT have such an internal pure resistor but either more wire length/turns or more resistive wire in order to come up with the resistance sufficient to limit points switching current to around 4 amps to avoid premature burning.
Again, GREAT PICTURE n thanks for more info, we (or us sparky types) got a lot of mileage out of such a simple but interesting lil coil question.....
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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