temperature gauge fault

Big Reidy

Recruit
Joined
May 14, 2019
Messages
1
My temperature gauge spikes and stays up when ignition switched on. Is this a faulty gauge, or could it be something else?
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
43,339
Could be the gauge or the sender

Make sure your getting 12V at the gauge when key is ON.
Check for a good ground from the gauge using an ohm meter to ground

If those check good, remove the sender and place in a pan of water on the stove with an ohm meter connected to it, and a water temp probe in the water
Should read 240 ohms cold and 33 ohms above 210 degrees
 

wellcraft-classic210

Master Chief Petty Officer
Joined
Sep 22, 2010
Messages
839
1 added comment
If the wire going from your gauge to the sender unit ( temp sensor ) on the engine is shorted to ground it will cause the gauge to read high also.

Good to know this for gauge trouble shooting also.
 
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