First issue is that a 12v system needs either a external resistor in the wire going to the coil (different than the resistor on the alternator), or a coil that is designed for 12v without a resistor. With that in mind, the coil overheated and boiled the oil inside it. This caused it to explode!. When it exploded, it may have shorted directly to ground and damaged the switch, or wiring to the ignition. There is a wire that runs to the ignition switch from the Amp meter. From the switch a wire then goes to the Ballast resistor (see above) or the coil positive.
Make sure there is voltage to the input of the switch, then the output of the switch (when on), then the coil wire where it comes out near the coil, and is attached (or not if none)to the resistor. If these are good, then checking the points and condenser in the distributor is next. The points may have been burnt from excess current flow when the coil blew. Good luck, Keep us in the loop. JimN
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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