When a starter rapid cycles like that, it's starved for amperage. The solenoid closes, the power is insufficient, so the solenoid drops out, as soon as it opens the connection, the voltage jumps back up, the solenoid closes, the cycle repeats.
You'll need an analog volt meter or a test light.
Start with your volt meter or light directly on the battery posts (not the cable ends). Take the voltage reading while trying the starter. If the power drops to near zero, the battery is bad. If the voltage is good, start methodically moving one test lead at a time, testing under load, until you track down where the drop is.
As you saw happen in the video, it can start cranking at any time, be careful!
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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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