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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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