I just checked Q's machine to be sure, and it looks like the group has it right: The two larger yellow wires go to the Tecumseh regulator and the smaller gauge wire (this one's black) is the ignition kill. There should be a three-wire connection on the regulator: The two from the engine charge coil and one that goes to battery positive. Hope this helped.
Stuck in the seventies- not in the swamp.
(6) Attex, a Hustler, a Super Swamp Fox, (2) Tricarts, (3) Tri-sports, a Sno-co trike, 3 Dunecycles, and a Starcraft! ...so far