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This may help with the one already converted, and a warning about the ones you are about to convert: When I obtained my 9N it had been converted to 12 volts. But, the alternator didn't keep the battery charged - in fact, it never showed any charge on the ammeter. One of the many times I was jump-starting the battery, I paid attention enough to observe that the polarity of the battery was wrong - it was positive ground. Here's the deal - the old, 6 volt system with generator was positive ground. ALL alternators are built for negative ground. So, one of the things you must do when converting to 12 volts is re-align your thinking about how the battery goes. I know, you have to change the battery too. But it's the mind-set that tells you positive ground that has to be changed. I have changed my battery, and am planning to pick up a rebuilt alternator in the next couple of days. By the way, the ignition and lights and any other devices on the tractor don't care about polarity. It only affects the generator/alternator.
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