> So you're saying a tail light is more prone to burning out than a headlight.
That's a silly comparison. The two bulbs have quite different designs; each is designed to dissipate the heat it generates. In the case of the two different coils, they both are nearly identical physically, but the "12 volt" coil has to generate and dissipate twice the heat of the "6 volt" coil. A better comparison would be two 120 volt, 100 watt incandescent bulbs. If you run one at 110 volts and the other at 130 volts, which one will burn out first? Most likely the 130 volt one, because it's generating much more heat than the other.
> I think a large wire and a small wire, run at the same temperature, are probably each just as durable.
The point here is the smaller conductor is carrying the same CURRENT as the larger conductor. So it is NOT running at the same temperature, it is hotter. Think fusible link: the smaller fusible link fails at a lower current than the conductor it protects.
> I don't think I've ever seen a 12v No External Resistor Required coil anyway.
Most auto parts stores carry them, or at least used to. I believe they were used as original equipment on VW Bugs, but I'm not sure about that. They are also available from everyone's favorite source of questionable tractor parts, TSC.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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