The key switch could be wired in a way that prevents ignition voltage when in the start position. To assess this, remove the wire at the starter relay (solenoid) and put a test light on the coil input wire. If the voltage is there, that isn't the issue.
If a coil is used that is designed for 12volt operation without a resistor, and if a resistor is used in this case, the coil will probably make enough high voltage to spark when running, but not when cranking. A 12v coil for use with no external resistor, will ohm at 4 to 6 ohms. A coil for use with a ballast resistor, will measure 2.5 to 2 ohms.
A battery going bad, or discharged will also make similar symptoms. Jim
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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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