Inop Temperture gauge

Bill Byford

New User
Massey 245 diesel,Inop temp gauge (original). Wiggles when cold
Stays on cold engine warm.Battery voltage to block sensor.Is this normal?I thought should be a resistance sensor.Thanks in advance
Bill Byford
 
A electric water temp gauge is just like a volt gauge so the sender will see voltage. Check the sender with an ohm meter, usually if the sender is shorted (0 ohms) gauge will read above 240F. If the sender has infinite resistance (Open) gauge will read below 120F. You could also just very quickly ground the wire going to the sender, and watch the temp gauge it should jump to the hot side of the gauge.
 

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