Your last schematic makes sense, but it leaves a couple of unanswered questions. If the wire from the coil goes to the "on" post of the key ignition, why does my tractor run with it going to the "off" post, as in my original schematic? The only thing I can think of is that the post on the back of the key ignition that I thought was "off" really isn't off at all. Maybe there is no "off" post? The back of the key ignition has posts at 12 oclock, 9 oclock, and 6 oclock, as viewed from the back, where the posts are. I thought the 12 oclock post was "off" because that is the corresponding position of the key when I turn the tractor off.
Secondly, in your schematic, I'm not sure where the wire from the amp gauge is attached to the key ignition. It should seemingly be attached to the "on" post. So there is now nothing attached to the "off" position? I would have thought prong 1 from the alternator should go to the off post, if such a post exists. Per the diagram called "Delco two wire alternator" at this link, prong 1 and the coil wire go to the same ignition post.
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