If your tractor actually has "stealth" 12 Volt generator, a repro of the original wiring harness will work, with the simple addition of a current limiting resistor (and possibly a different ballast resistor) in the coil circuit. Or, if it has a 12 Volt alternator, simple and GOOD wiring diagrams for that system are readily available on the 'net, too. Keeping an "'N" with either electrical system in tip-top running condition is certainly not rocket science! The same key switch and light switch will work for either voltage, and, of course, you'll need light bulbs to match your choice of voltage. I can understand people staying with 6 Volt if absolute originality is important to them, but on the other hand, a properly done 12 Volt negative ground system that matches the electrical systems likely to be found in vehicles, etc. around the place has it's advantages, too. For every one that posts on here bragging about how well their original 6 Volt system works, someone else posts asking about how to jump-start a 6 Volt positive ground system with a 12 Volt negative ground system, or how to fix the damage they've done with an incorrectly connected jump start. The importance of commonality of electrical systems probably doesn't seem important until some evening at near-dark, when you're got the "'N" at the far end of your backlot with a dead battery, and it's starting to rain! So, the choice is yours, but personally I appreciate the 12 Volt conversions on several of my old tractors, and can tell you there's nothing to fear, and many benefits to a neatly and properly done 12 Volt conversion.
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