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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 19713" data-attributes="member: 307">JohnDoes this light come on everty time you start? does it ever go off? Most of these work by ground the light to turn oit on, if the wire has rubbed through to a bare mettal part anywhere on the machine it can be getting a ground like that and would be on all the time. Also possible its a bad sender. Should test normally open unless heated to 200 to 220 degrees (my estimate) if its closed at room temp it may need replaced.Also, your sure its your water temp light? not your charge pressure light or hydraulic temp light? Some machines used 1 warning light for multiple functions, I can't say for Case for sure. Try unhooking the wire at the water temp sender (temporarily) on the engine and see if the light goes off to verify thats the correct light if you have any doubt.Look up a cummins 4bt engine at <a href="http://www.zerostart.com" target="_blank">www.zerostart.com</a> and you will be able to get a part # for your block heater unless you really want to pay 4x for the case or cummins part. Ken</blockquote>