montyjn Posted November 18, 2021 Share Posted November 18, 2021 3.5 v8 110 1988 Recently my temperature gauge has started reading excessively high (no relevant recent work to the dash or sender that I can think of). I've checked the actual temperature of the engine with a laser thermometer and all seems well. Am I right in thinking that the gauge is supplied with 12v and then the temperature sender is effectively a variable resistor in the circuit? In order to fault find, am I best looking for leakage to earth, or poor earth connections at the gauge / engine? I've tried a spare sender I had and the change in sender does not seem to solve the issue. Welcome any guidance on how to approach looking at the issue / how the circuit works! Monty Quote Link to comment Share on other sites More sharing options...
monkie Posted November 18, 2021 Share Posted November 18, 2021 If I remember correctly the gauge is supplied with 12v, the striped wire then leaves the gauge to the corresponding sender and is earthed via the sender to the engine block. Worth getting a new sender of the corect type for your gauge fitted. Quote Link to comment Share on other sites More sharing options...
western Posted November 18, 2021 Share Posted November 18, 2021 Could be a dying temp gauge. its a simple circuit, from sender [earthed via engine block] single wire to the gauge signal connection, gauge needs a 12v power feed & a earth. Quote Link to comment Share on other sites More sharing options...
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