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Sorry have been away for awhile, but yes replaced the sensor with a known good one. Shot the case where the sensor was with a thermo gun an was not over heating. Was maybe around 165 or so.Yep. Shared ground going to the sensor and other wire, only 2 to it, goes to ecu. Sensor trips and passes the ground to ecu to trigger the light. Sensor mechanically trips at a set temp to complete the circuit. Common sensor for temp lights and fan control. Already swapped to a known good one so should eliminate the sensor.