Ignition "ON", points "open", you should have battery voltage at BOTH low tension terminals on the coil.
Ignition "ON", points closed, you should have voltage at the "ignition switch" side of the coil and NO voltage on the distributor/breaker point side 'cuz that end of the winding in the coil is connected to chassis ground through the breaker points.
Whip out a test light and see what's going on on the points side of the coil with the points open, then with them closed, and post back.
If NO voltage on points side of coil with points "open", insulator at distributor terminal may be shorted, condenser may be shorted, or something else in that area that is NOT supposed to be touching ground may be out of place, and grounding.
To gain a good understanding of how Kettering ignition systems work, take a look at the John Deere FOS-20 manual for ignition systems.
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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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