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From the photo it doesn't look like the resistor's zig-zaggy element is broken so you may still be able to read the resistance of the resistor with a multimeter. Ohmite vitreous power resistors may have a close replacement. Other than that a repair shop or the tractor maker would be the place to go.
If the glow plug is 12 volt and the resistor is to drop 12 V from 24 to 12, then the resistor is of the same resistance as the glow plug.
Quote from: soldar on February 07, 2019, 03:54:18 pmIf the glow plug is 12 volt and the resistor is to drop 12 V from 24 to 12, then the resistor is of the same resistance as the glow plug.Noting that the resistance of the glow plug will likely increase when running at it's intended temperature compared to cold.