If the system is a 12 volt then the small wire to the coil makes sense because it would kick up the normal 6 volts from the coil to 12 volts while the engine is starting. The old Ford cars used that type of solenoid but with the starter switch in the ignition switch. I assume that some of the Ford tractors with 12 volt systems would use that design but then I don"t know if they still used the push button starter switch nor how it would be wired.
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