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Tractor Talk Discussion Forum

elect temp guage

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stan

02-15-2004 16:31:47




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How is the sending unit wired to the the water temp guage, and would the oil pressure sending unit be the same? Thanks Stan




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Ben in KY

02-16-2004 08:35:04




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 Re: elect temp guage in reply to stan, 02-15-2004 16:31:47  
Stan,
Temperature gauges come in at least 2 types. The older type uses a capilary tube between the temperature sensor and the gauge. Be very careful not to crimp or damage the tube. The other type is electrical in operation as the other posters described.



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Lew

02-15-2004 20:35:45




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 Re: elect temp guage in reply to stan, 02-15-2004 16:31:47  
If the sending unit has only one terminal, then the connections go from power to gauge to sending unit which controls the amount of current by varying the resistance value to ground. In the temp gauge that means at low temp the resistance is high so little current flows and as the coolant heats up the resistance is lowered and more current flows causing the gauge to show a higher reading. In the oil pressure gauge the resistance is high with no pressure and lowers as pressure increases. The two sending units vary resistance by different methods so are not interchangeable.

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Jon H

02-15-2004 20:31:30




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 Re: elect temp guage in reply to stan, 02-15-2004 16:31:47  
Depends on the guage design, Some have only 2 terminals( power and sender) others also have a ground terminal at the guage. The senders are not the same. The oil guage sender reacts to pressure,while the temp guage sender reacts to temperature.



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TDK

02-15-2004 19:04:52




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 Re: elect temp guage in reply to stan, 02-15-2004 16:31:47  
Stan,I believe guages will have two connections,one goes to power source & other goes to sending unit. Both guages work basically the same.



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