Reply to "water temperature sending unit"

rockyMember

The senders are just temperature sensitive variable resistors.

You can check "gross functionality" with just an Ohm meter.

Here's some data from JFB, showing the relationship of resistance vs. temperature for a "typical" sender. So if you have one at room Temp,, it ought to read AROUND 120 Ohms, and if you heat it up, you should see the resistance drop.

Anyway - a fun project if you have your sender, and are wondering if your sender is good or not...

You should also be able to plug a 25 Ohm resistor to the sender lead and ground, and your gauge should go to about ABOUT 200 Degrees. Easy way to check the wiring and gauge.

(Plot credit Stephen of S&N Clocks)

Rocky

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