It really makes no difference whether you put the disconnect on the + or - post ,, except for one fact,, and test me on this,, disconnect the neg cable at the battery (neg ground system or pos cable for pos ground), hook up a test light or volt meter ground lead to the the disconnected battery post, now turn on a headlight switch or turn on the ignition switch for points (closed points, or pertronix ignition) for a closed circuit, then touch your test light or volt meter lead anywhere on the tractor that is not painted or rusted, and note the result.
Now if you want the safest disconnect possible consider that your breakers in your house disconnect the positive power source,,,think about why!! :!:
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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