You're saying it sparks and you have changed it back to positive ground I assume. So, I would unhook the battery wire from the voltage regulator and see if it still sparks as I think the points in the cutout arced and are now stuck together.
If it still sparks with that wire unhooked you have other problems but I doubt that. Take the cover off regulator , look at cutout points. If stuck, pull them apart and polish the contacts, with wire still disconnected. Point file , rifle file is best but fine emery will work if completely cleaned after like with brake cleaner.
Then, hook up wire and battery ground. Polarize at generator by using jumper wire between that battery terminal on regulator to a quick flash to the armature terminal on generator. Then hope it works and didn't fry something else.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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