If (and only if) the resistor you have is good should you use it. If it has about 2 ohms of resistance, it is good. Use it. If you aren't sure how to read ohms, use a test light as follows: remove the wire from the coil connected end of the resistor. Hook a wire from the battery positive to the other end of the resistor. use a test light to ground to the disconnected end of the resistor. If it lights the resistor is good. Use it. If it lights only on the battery connected end and not the other it is bad, Get a new one as specified above. I would replace the coil with the one above. It is fine for the use of the tractor and was chosen for appropriate values not price. Jim
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