Remove the battery before you do anything, disconnect it, pull it out, set it in a safe place. Before I go on, just a couple of cautions on the actual work, if you don't follow them, it might best to have a pro help you. Your wiring diagram may be a lot more complex due to having a voltage regulator as many later machines had, but, when you convert, that's coming out and will never be used again. Take the following wiring diagram as an example. Thankfully, most were made before the days of computers, sensors, even true voltage regulators, some didn't even have an ignition as we think of it, just a magneto that was totally discrete from the tractor's wiring. Old tractors had no fluff, like modern contraptions, in their wiring. If your machine doesn't have a kit, buying the individual parts and making your own wiring changes is very likely self explanatory. Well even if there is no kit with instruction sheet and harness, converting to a 12 volt alternator on most old tractors is actually quite simple, and if you look at your wiring, you can figure it out. The fact is, since we can't see the tractor and how it's currently wired, it's hard to be of help beyond what the instruction sheets say. Some kits are so complete that they provide a new wiring harness, while other tractors don't have kits at all, just individual mounts, an alternator, and a ballast resistor.
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We have a variety of answers depending on what kit they purchased.
FARMALL M GENERATOR HOW TO
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