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    Fuel gauge not working after dash replacement

    So all done ish on dash, electronic speedo calibrated and happy, other gauges working fine but not fuel gauge.
    Tried new gauge, no joy.
    Bridged earth and low fuel terminals of sender and light comes on, did same with gauge wire and earth, no joy. Removed sender, Checked float sound, low fuel light bit works but no gauge change.
    So what next? Tracing wires from sender to gauge sounds almost impossible as they are in the loom. Any thoughts?
    Thanks
    Ian
    1973 Stag 1983 Alfa GTV6
    ​​​​​​2006 BMW R1200GS 2013 Audi A4 Avant Quattro

    #2
    Voltage regulator perhaps.

    Alan

    Comment


      #3
      Thanks I'll have a look, might have knocked a wire off.
      1973 Stag 1983 Alfa GTV6
      ​​​​​​2006 BMW R1200GS 2013 Audi A4 Avant Quattro

      Comment


        #4
        Eureka moment, regulator is on back of old speedo that's in the boot as I now have electronic one - I assume that's it, so just need to reinstate that... Or do i
        1973 Stag 1983 Alfa GTV6
        ​​​​​​2006 BMW R1200GS 2013 Audi A4 Avant Quattro

        Comment


          #5

          If the Temp gauge is OK then regulator probably good. As you have just been in the dash then odds are you disturbed a wire there. check you have voltage on one end of the gauge (light green from the regulator, which should have 2 light green wires on it) and ground the other end of the gauge(maybe you did that?) it should show full. Next stop is the multi plugs to the dash. Its unlikely but the next stop is the plug in the right footwell that feeds the rear loom.
          Terry Hunt, Wilmington Delaware

          www.terryhunt.co.uk

          Comment


            #6
            Yes! you need a regulator.. it feeds the fuel and temp gauges.
            Terry Hunt, Wilmington Delaware

            www.terryhunt.co.uk

            Comment


              #7
              "Eureka moment, regulator is on back of old speedo that's in the boot as I now have electronic one - I assume that's it, so just need to reinstate that... Or do i"

              Lucky you took up with classic cars and didn't try parachuting.



              Alan

              Comment


                #8
                There's a moral to that story...

                Comment


                  #9
                  Very true!!
                  1973 Stag 1983 Alfa GTV6
                  ​​​​​​2006 BMW R1200GS 2013 Audi A4 Avant Quattro

                  Comment


                    #10
                    I've had email to register vehicle, however you can't fill in booking ref and it's a mandatory field, any ideas?
                    1973 Stag 1983 Alfa GTV6
                    ​​​​​​2006 BMW R1200GS 2013 Audi A4 Avant Quattro

                    Comment


                      #11
                      OK so latest on the Fuel Gauge/Speedo set up.
                      So all fine as previously stated (still glad I didn't take up parachuting...), Caerbont speedo great and fuel gauge working fine until I filled up with petrol on way back from Silverstone. The fuel gauge went off the scale on the right (not a problem?...) but at that point I noticed speedo wasn't working and mileage/trip not changing.....done 80 or so miles and fuel gauge went down as it should.
                      Im assuming this could be to do with voltage regulator as its the only thing I've touched and as I unfastened it from the speedo clamp, gauge went back up to very full again - but still no speedo reading (power definitely OK as speedo illuminates and mileometer numbers light up).
                      So any ideas? speedo was working on approach to garage as its a 30 limit and I was checking speed.
                      Not sure why a voltage regulator would affect an electronic speedo, and then cause fuel gauge to misread when not fixed onto a metal bracket.
                      Thanks
                      Ian
                      1973 Stag 1983 Alfa GTV6
                      ​​​​​​2006 BMW R1200GS 2013 Audi A4 Avant Quattro

                      Comment


                        #12
                        Originally posted by barkerwilliams View Post
                        "Eureka moment, regulator is on back of old speedo that's in the boot as I now have electronic one - I assume that's it, so just need to reinstate that... Or do i"

                        Lucky you took up with classic cars and didn't try parachuting.



                        Alan
                        Ha ha.
                        There are 2 secrets to staying on top :- 1. Don't give everything away.
                        2.

                        Comment


                          #13
                          The Voltage Reg needs an earth (via its mounting) to work, otherwise it just passes on battery voltage. As standard, it gets its earth from the speedo can, which is earthed as part of the light in the gauge.

                          Can't comment on your Caerbont speedo as I've not had any experience, other than to observe that its malfunction seems related to your VReg, so wiring issues are indicated.
                          White 1976 build ("Mk2") only a few mods

                          Comment

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