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  • #16
    If you haven't already done it remove the pig tail wire that goes from the sender to the harness and run a new wire to the sender. You can use alligator clips temporarily. You could have an internal break in that small wire. It could be just enough to affect the reading. The fact that you say it works every once in a while could be a clue that it's a bad wire.

    John
    John Pizzi - Squarebirds Administrator

    Thunderbird Registry #36223
    jopizz@verizon.net 856-779-9695

    http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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    • #17
      The wire going into the tank (the sender) goes into some type of rubber seal at the tank, do I just pull it out gently or opening up the tank to get to the the wire?
      Tim
      1962 Conv Tbird
      1993 Miata LE
      1994 Miata

      Comment


      • #18
        You said the wire from the sender goes into a connector (most likely a bullet connector). If you ground the wire at that point the gauge goes to full. Remove the wire at the bullet connector and run a new wire temporarily from there to the sender. See if the gauge goes above 1/4.

        John
        John Pizzi - Squarebirds Administrator

        Thunderbird Registry #36223
        jopizz@verizon.net 856-779-9695

        http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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        • #19
          I don't get when I connect the sender to the harness, leaving juuust enough metal exposed and I ground the two connect wires it goes to a full tank.
          Tim
          1962 Conv Tbird
          1993 Miata LE
          1994 Miata

          Comment


          • #20
            If you ground any part of the wire from the sender back to the gauge it's going to read full. Once you ground it you take the sender out of the circuit.

            John
            John Pizzi - Squarebirds Administrator

            Thunderbird Registry #36223
            jopizz@verizon.net 856-779-9695

            http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

            Comment


            • #21
              ok the last post makes sense.
              So you want me to disconnect the wires, then just run a new wire between them.
              Tim
              1962 Conv Tbird
              1993 Miata LE
              1994 Miata

              Comment


              • #22
                Originally posted by blue62tbird View Post
                ok the last post makes sense.
                So you want me to disconnect the wires, then just run a new wire between them.
                Yes. If the gauge goes up to 3/4 or above then you found the problem. If it stays at 1/4 then the sender is the problem.

                John
                John Pizzi - Squarebirds Administrator

                Thunderbird Registry #36223
                jopizz@verizon.net 856-779-9695

                http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

                Comment


                • #23
                  makes no sense, just pushing a wire into the female plug (from harness) and touching the sending unit male end. Or is there another connection in the truck further up the harness?
                  Tim
                  1962 Conv Tbird
                  1993 Miata LE
                  1994 Miata

                  Comment


                  • #24
                    Originally posted by blue62tbird View Post
                    makes no sense, just pushing a wire into the female plug (from harness) and touching the sending unit male end. Or is there another connection in the truck further up the harness?
                    I don't know why it doesn't make sense. All you are doing is replacing the factory wire with a new piece of wire.

                    John
                    John Pizzi - Squarebirds Administrator

                    Thunderbird Registry #36223
                    jopizz@verizon.net 856-779-9695

                    http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

                    Comment


                    • #25
                      one last volley, pull the wires and take my own wire and push one end INTO the female plug and fasten the other end of my wire to the male sending unit wire plug. If that it is the case seems to me all I am testing is the two connection points.
                      Tim
                      1962 Conv Tbird
                      1993 Miata LE
                      1994 Miata

                      Comment


                      • #26
                        Take a new piece of wire and push one end into the female harness connector and connect the other end of the wire to the sender post(use a clip to hold in place). Then check your gauge.

                        John
                        John Pizzi - Squarebirds Administrator

                        Thunderbird Registry #36223
                        jopizz@verizon.net 856-779-9695

                        http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

                        Comment


                        • #27
                          I will do that. If gauge does not change I have a bad sending unit? Or the wires leading up to each of those connectors are bad?
                          I would have a hard time thinking there is a shorted wire. None of it looked like it has been touched since orig install. Like new.
                          Tim
                          1962 Conv Tbird
                          1993 Miata LE
                          1994 Miata

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                          • #28
                            If the gauge stays at 1/4 where it was then the sender has to be the problem.

                            John
                            John Pizzi - Squarebirds Administrator

                            Thunderbird Registry #36223
                            jopizz@verizon.net 856-779-9695

                            http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

                            Comment


                            • #29
                              well the wiring to the gauge is good, I have completed the circuit, the gauge moved.
                              Tim
                              1962 Conv Tbird
                              1993 Miata LE
                              1994 Miata

                              Comment


                              • #30
                                Thank you for putting up with me. I will try again after work tomorrow. I wish you lived down the street! ha ha ha
                                Tim
                                1962 Conv Tbird
                                1993 Miata LE
                                1994 Miata

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