For sure, Ive seen many wired backwards and still run (I was a used tractor dealer for years and have about seen it all lol) but data Ive seen shows the coil voltage has to rise as much as 4000 volts higher if wired backwards meaning less efficiency and more heat losses if wired backwards. Its easier to emit electrons from a plugs hotter (electrode) to a relatively cooler (ground strap) is the reason, same reasons why theres a heater under the cathode in an old fashioned radio tubes.
Also right on what can happen if 12 volts is applied to a 6 volt coil (i.e. no ballast), they can get so hot the nasty black oil boils out and/or the coil just has like a melt down.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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