While on the subject of 12V genny I just picked up a ran when parked 1959 cub yesterday. It has a 12volt battery in it-neg ground. When I popped off the hood the genny doesn't have the standard delco tag on it, no rivit holes either. The PO said he had something rebuilt about ten years ago but he couldn't remember what it was. Since the change to 12 volt was made in '65 I was thinking it was a Positive ground six volt system. The 12v battery in it was hooked up and the date on the battery was june '06. I hooked up a fesh 12 volt battery neg ground, polished the points,drained and put fresh gas, new screen in the sediment bowl, drained the carb, clean the meter vent hole. It started right up. I didn't run it long because the fan hub bearing was making some noise. It could be that this system may have be change over right, whcih is not usually the normal case. Will investigate further.
Kirk