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Ron..... .....I know of 8 ways to successfully convert the old 6 volt 9N tractor to 12 volts. Some are more technically elegant, some more crude. And in particular, with the frontmount ignition system, there are 2 VERY DIFFERENT problems that MUST BE addressed. "the coil" Some converters use a 12 to 6 volt converting resistor and the OEM 6 volt ignition coil and the mandantory "infamous ballast resistor". (thats 2 resistors connected in series like flashlight batterys). Because it is cheapest. (12 to 6 volt converting resistor $5, modern 12 volt frontmount coil $40) Other converters use just the modern 12 volt frontmount coil without ANY resistors. Some conversion kits include a resistor that may or may NOT be the correct value. DO NOT USE the "infamous ballast resistor" with the modern 12 volt coil. Understand? BTW.....it is difficult to externally determine if the new square frontmount ignition coil is a 6 volt coil or a 12 volt coil. HINT: permanently mark your new 12 volt coil as being a 12 volt coil and date installed. The next mechanic that works on the tractor will blessyou. I'm not a fan of the deceptively desirable "1-wire Delco" 12 volt conversion because ya gotta jazz that cold engine to 1800 rpms before the alternator starts charging. Your N-Engine max's out at 2200 rpm and idles at 400 rpms. 1-wire conversions work well with old automobiles because you generally bring the engine speed up to 3000 rpms before you dump the clutch to get moving. I prefer the way Chevy does it, with the "idiot light" and 3-wires, 'cuz it starts charging at 500 rpms. But to answer your questions:
Yes, the 12 volt alternator solid state gutts absolutely DEMAND NEGATIVE BATTERY ground.
Yes, the resistor must be between the ignition coil terminal and the ignition switch "ON" terminal or else you can't turn your engine off. Yes, the alternator 1-wire big output STUD is connected to the battery. Typically at the roundcan starter switch BATT stud, 'cuz its convient. I'm a 12 volt advocate for the right reasons, that said, I haven't found the right reason to convert my eazy starting 6 volt 52 8N to 12 volts and I know how to do it right, the first time..... ....respectfully, Dell
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