"I think resistors have been talked to death here " SOOOOOOO TRUEEEEEEEEE
You can say that again my friend lol but people keep asking questions so here we go again.
Good informative post........heres a small addition for those unaware.....Two Cylinder Deeres used the wirewound ceramic/porcelain encased "bathtub" style ballast resisitors while some of the New Generation switched over to the carbon types you described and the kind you spoke of which increased resistance as they warmed up and NO BY PASS WAS THEREFORE REQUIRED.
Some years back, around 2003 or 2004 I believe, Id have to dig out the magazine, The "Green Magazine" hired me to write a full feature artice on Ballast Resistors so if anyone wants to learn even more in detail, (cant imagine why, its gets technical and boring) they can e mail me and I think I can find the word file (if not lost when I had a crash)
Boring but still fun sparky chat, hopefully we put this to rest for a while at least
PS Id define a coil labeled "12 volts" or "12 volts NOT for use with external ballast resistor" or "12 volts no ballast required" etc etc is designed and engineered to still produce a sufficent spark,,,,,,,,and dissipate the heat,,,,, when input voltage is reduced to as low as around 9 volts (such as while cranking),,,, but still produce a spark, handle the current and dissipate the heat even when voltage is raised to 14+ by the charging system. i.e. designed to produce a spark over an input voltage RANGE from 9 to 14+ .........Call it a 12 volt "nominal" coil if you will
FUN CHAT, as always for us sparkies, take care n keep warm up your way, Im headed South real soon
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