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JD 990 with only 30 hours. On ignition, the temperature guage needle moves clockwise all the way beyond the red zone and remains off scale. Coolant level is OK and the radiator cap is not hot to touch. Have tried several re-starts and have engaged the PTO chipper/shredder attachment for 30 minutes without any excessive heating of the radiator. Seems like an electrical issue. No other malfunction on the instrument cluster. What is the most likely cause of this?

JD 990 Temperature gauge malfunction
John Deere Tractors
Replies 2 Post by jsmcfadden