You say its now 12 volts, first thing that comes to mind is you are still using a 6 volt coil !!!!!! If so it will run very hot and eventually burn up and open becaase at 12 volts its drawing twice its intended current, in which case the points will also burn up prematurely.
The easiest thing would be to buy a full true 12 volt coil (NO ballast required) and use it. Of course, you could use a 6 volt coil plus an in line series voltage dropping (12 to 6) Ballast Resistor, but why do all that and have the extra expense plus extra connections to go bad UNLESS you rig a ballast by pass system for starting only which yields a good hot starting spark.
NOTE the coil is also somewhat polarity sensitive, so at Neg groudn wire its lil + terminal to the ignition switch and its other lil - to the distributor.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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