Adrian Lawton Posted March 22, 2018 Report Share Posted March 22, 2018 (edited) My temp gauge and voltmeter have stopped reading for some reason. I changed the temperature bulb on the thermostat housing with no success. I shorted the connector to earth which should send the gauge to max reading ( zero ohms so max current) but no movement. I did think that the 10v regulated instrument supply might have gone but the petrol gauge reads normally (well in it's usual rubbish way!). I had thought the voltmeter was direct off the ignition switch so maybe it's just coincidence or TR6 gremlins again. Any ideas before I take the gauges out of the dash? Edited March 22, 2018 by Adrian Lawton Quote Link to post Share on other sites
RobH Posted March 22, 2018 Report Share Posted March 22, 2018 Not the regulator else the fuel gauge wouldn't read. The voltmeter should go to battery live while the other comes from the regulator so its not on the supply side - possibly an earth connection to those meters has failed ? Quote Link to post Share on other sites
brian -r Posted March 22, 2018 Report Share Posted March 22, 2018 Hi Adrian. Has someone changed the fusing arrangement/ wiring at some time. Had similar troubles on mine , it was hidden fuse behind dash. good luck Brian Quote Link to post Share on other sites
JochemsTR Posted March 23, 2018 Report Share Posted March 23, 2018 Hello Adrian, Voltage comes directly from ignition. Same as Temperature (but after fuse). Did you check the ground connections? I know its a hassle, but you should be able to reach the little screws of the instruments to pull them out. That is really the best way to check voltage/ground @ the instruments. Regards Jochem Quote Link to post Share on other sites
JochemsTR Posted March 23, 2018 Report Share Posted March 23, 2018 electrical '74 other models available too. electrical-tr6-74.pdf Jochem Quote Link to post Share on other sites
Adrian Lawton Posted March 23, 2018 Author Report Share Posted March 23, 2018 (edited) Thanks Guys, It was the 10v regulator after all. Checked it out and no output? Can't explain why the fuel gauge was working without 10v. I suspect that it is being fed with 12v from somewhere - god knows where! Edited March 26, 2018 by Adrian Lawton Quote Link to post Share on other sites
JochemsTR Posted March 24, 2018 Report Share Posted March 24, 2018 Hello Adrian, if your fuel gauge is being fed from somewhere else....did you at least measure the voltage? It really should be connected after the regulator..... Jochem Quote Link to post Share on other sites
Adrian Lawton Posted March 26, 2018 Author Report Share Posted March 26, 2018 Finally sussed what was wrong. 10v regulator had failed. Swapped it for a Rimmers special and hey presto temp gauge registering and voltmeter registering 10v and fuel gauge reading. It's clear that the 12v gauge is being incorrectly fed from the 2nd 10 supply designed to go to the fuel gauge and the fuel gauge supplied by the 12v supply meant for the voltmeter - with me so far. Set about trying to correct the miss-connection and after two hours of hand scrapping, frozen shoulder and bad back from lying prone in the footwell even after taking the Tacho out to see if I could reach, I gave up. In can live with an errant voltmeter and over the 14 years of owning the car have got used to the quirky operation of the fuel gauge. If I ever feel the urge to rip out the dash and everything behind it I might sort it out - but life's too short to worry about a couple of volts going walk about I guess. thanks for all your words of wisdom guys. Quote Link to post Share on other sites
Bodiam Posted March 26, 2018 Report Share Posted March 26, 2018 Hi, Adrian, Given that the original voltmeter isn’t exactly a precision instrument, I bought a digital voltmeter for a few pounds on eBay and plugged it into the cigarette lighter socket which I have on the dash. It may not be that much more accurate, but at least you have some nice red numbers to look at! John Quote Link to post Share on other sites
JochemsTR Posted March 27, 2018 Report Share Posted March 27, 2018 I may get crucified for this....get rid of the smiths and install stack. No need for a 10V regulator anymore...including dash lighting... Jochem Quote Link to post Share on other sites
stuart Posted March 27, 2018 Report Share Posted March 27, 2018 I may get crucified for this....get rid of the smiths and install stack. No need for a 10V regulator anymore...including dash lighting... Jochem Yep, kit car Stuart. Quote Link to post Share on other sites
JochemsTR Posted March 27, 2018 Report Share Posted March 27, 2018 That hurts..... Quote Link to post Share on other sites
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