There are two kinds of coils on 12 volt systems One, the kind you are wired up for, is a 6 volt coil that requires an inline resistor (the ceramic piece you see) to reduce the voltage into the coil.
The other takes a 12 volt input but has the resistor built into the body of the coil to reduce the voltage, eliminating the need for the inline resistor.
If for some reason your inline resistor went bad, that could have fried your existing coil.
So, two thoughts. If you go with a 6 volt coil, I'd replace the resistor (they're readily available) as part of the project. The alternative is to go with the 12 volt coil with the built-in resistor, in which case you want to take the resitor( the ceramic piece) out of the line in.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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