Top one welds bottom original. You get different voltage at different rpm but the amperage is constant to the alt. So if higher or lower amp is needed you swap the alt accordingly. Works good I alsocarry an electric fan to flow air through the radiator. I like it for a portable stick.
My hook up is a lage gauge jumper cable positive to the alt output ground is ground and to turn it on and off I just hook the alt exciter up to full 12v. No regulator.