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Walt..... ....that is one of the joys of 12 volt conversions, so many ways (grin) and some of them even work. But specifically, the Delco SI-10 12 volt alternator, whether the 3-wire or the 1-wire version, BOTH have a built-in voltage regulator. Despite the deceptively simple concept of a 1-wire alternator, I'm not a 1-wire alternator advocate BECAUSE 1-wire doesn't start charging until engine rpms of about 2000 rpms, and the N-Engine maxes out at about 2500 rpms. I just don't like jazzing a cold engine that high rpms to get a charge started. With a 5000 rpm automobile engine, you generally bring your engine up to 3000 rpms to get moving down the road so it is not a problem. Tractors are low rpm engines. I really recommend the 3-wire version of the Delco SI-10, It starts charging at about 500 rpms. Its just a little bit more complicated. Are you electrically challenged? or do you feel confortable with simple electrial stuff?..... ...Dell
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