Gary, thanks for the update, I think I already answered all your questions but just to be sure here goes again:
1) The fact that the mag is grounded to the block (isn't it?) ... and has points .. I was just wondering if hooking up a battery would interfere with that [like a "shut off switch by grounding the mag" .. ] ...
NO it WILL NOT interfere. As I posted below your tractor was originally POS Ground, so if you're using a Generator (NOT an alternator) Id hook the battery + to frame and - to the starter and I would polarize the genny before starting.
2) it actually has a starter and generator on it .. I just couldn't figure out in my mind which way to hook up the battery . :) ...
POS to frame - to starter if you want to keep it original and it has a generator NOT an alternator. It will still work at Neg ground and starter still turns same direction and will charge if the genny is polarized and its has the correct voltage regulator etc. but if it has an ammeter its leads need swapped
3) The battery is so old .. it must be bad .. it won't fire .. YET ..
The battery (good or bad or dead or hot) has nothing to do with whether or not the mag will fire
You may want to re read my post below once more, it and this pretty well addresses most of your potential issues
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