The simplest way I can think of to get it running would be a temporary hotwire. All you need is some spare wire that you may have laying around. Or just re-use some of the existing wiring.
You need a lead from the positive side of the battery through a simple toggle switch, and then down to the positive side of the coil. This will provide power for spark, and the toggle switch will allow you to shut it off if needed.
Then you will need a lead from the positive side of the battery to the starter button on the dash (I would assume you already have a wire for this) and then another wire off the other end of the push button that will run directly to the "A" terminal on the starter/generator. When you push the button this should supply power to the starter/generator and spin the engine over.
Of course you also need a wire from the negative battery terminal to somewhere on the tractor frame to act as a ground.
This setup will bypass the safety and charging systems, allowing you to simply test the engine's functionality. Just a disclaimer, If/when you verify that the engine will run, do NOT use this setup to drive the machine as it is quite dangerous, you'll also need the charging system if you want the engine to stay running, otherwise the battery ignition will kill the battery as it runs.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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