> 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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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