Haddock Posted November 30, 2019 Share Posted November 30, 2019 My Caterham temperature gauge is rather fickle in the sense it's is occasionally shows random hot and cold when running. Today both the temperature and fuel gauge continued to show a reading when the ignition was off. When turning the ignition on both needles swept the gauge as normal. it's a 2018 360rJust wondered if this was a a common issue or something I should investigate further Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 30, 2019 Member Share Posted November 30, 2019 I'd investigate further.But I don't know how those modern ones work (the ones that do the sweep).Have you got a multimeter? And a wiring diagram: if not let me know if you'd like one....For the temperature gauge: with the ignition on what happens when you disconnect at the sender, and when you short the sender connection to earth?Jonathan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 30, 2019 Member Share Posted November 30, 2019 Anyone, please:With this type of instrument is all the clever stuff inside the instrument itself? And are the electrical connections the same as on traditional instruments?ThanksJonathan Link to comment Share on other sites More sharing options...
revilla Posted November 30, 2019 Share Posted November 30, 2019 I seem to remember (not got diagrams in front of me now) that the clever stuff is inside one of the instruments, possibly the tacho, and that then controls the others. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 30, 2019 Member Share Posted November 30, 2019 Thanks.Wiring up comes up through the tacho, but I can't work out if it's just a connector or adding the sweep.It would be nice to disconnect one of the instruments, jury rig it, and see.Haddock: This could be useful in fault-finding as it helps to identify a single point of failure for two different instruments/ circuits. Earths are common candidates for that but yours staying on when it shouldn't doesn't sound like that.Jonathan Link to comment Share on other sites More sharing options...
Haddock Posted December 1, 2019 Author Share Posted December 1, 2019 Thank you Jonathan and Revilla !I can see more investigation is required . The car is still in warranty so I ll check with Caterham next in case the gauges / wiring are covered. It's a self build but of course the gauges are pre fitted / wired by Caterham If it's not covered I'll make a start myself as suggested Link to comment Share on other sites More sharing options...
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