Steve: Actually the Super A had several changes. I believe it started out with a cut out relay on top of generator. It went to voltage regulator, and I'm not certain if any regulators were mounted on top of generator. The generator that was on my 53 SA was mounted below the generator.
What I can't understand in all these electrical discussions is why would anyone want to keep a blasted old generator. They were trouble from the day they were new. They are 3 times as costly to rebuild. I was like you folks 20 years ago, except I needed 12 volts on my 130 for operating a 12 volt electric motor on seeding equipment for small vegetables. I decided I'd use both generators to keep my Super A 100% original. Within two weeks both generators packed up, one of them actually caught fire. I was cultivating rutabagas and had to use plant leaves to smother the flames. Off to the rebuilder with both generators. I told him it had to be quick, and it had to be 6 volt, as I had a new 6 volt battery. He responded, "quick with those old generators is two weeks as I don't have the parts, quick with a new 6 volt alternator will be 5 min. as I only have to change the internal regulator on a GM Delco to 6 volt. Same price as the 12 volt alternator with internal regulator." 5 min. later I was on my way. Two hours later I had fabricated an alternator mount and was cultivating rutabagas.
That 6 volt battery lasted 13 years starting in Canadian winters. I have never looked back, my tractor starts better, runs better, generally a whole lot less hassel. I now have 3 alternators on SA, 130 and 140. I like the 6 volt SA as well as the 12 volt 130 and 140. there is nothing wrong with 6 volt, just get rid of those damn old generators, you'll have a lot less gray hair. An if an alternator goes bad, a new one down at your local auto parts store is about 1/3 the cost of rebuilding the generator. I my opinion there is nothing you can do for under a $100. that will improve your old tractor as much as an alternator.
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