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Test an oil pressure gauge?-gctid821645

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    Test an oil pressure gauge?-gctid821645

    My oil pressure gauge pegs to high as soon as I turn on the ignition switch and stays there while the engine runs. The only time it moves is when I turn off the key, and it drops back to zero. The engine has always run at 40 PSI. The wires on the gauge are in a molded plastic harness that can only be put on one way. I replaced the oil pressure sender, but that make any difference. I was going to wire the gauge directly to the sender to see how it reads, but don't know how. The gauge has several posts in addition to one for the light. One is marked Ground but I don't know what the other two are for. There's only one wire on the sender - blue.
    1998 Capri 1950CL
    3 Liter MerCruiser
    Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
    2 batteries with Combiner, Joystick Wakeboard Tower

    #2
    (S) LT BLUE - sender signal wire

    (I) PURPLE - Ignition switched or 12VDC +
    Joon, Kathy, Jaden & Tristan
    93 3058
    92 2855
    91 Fourwinns 205
    Longbranch WA
    Life is Good

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      #3
      So, can I just go to the engine , connect the sender to the gauge, the gauge to battery positive and negative?

      I'd expect no reading until I start the engine, then 40PSI.
      1998 Capri 1950CL
      3 Liter MerCruiser
      Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
      2 batteries with Combiner, Joystick Wakeboard Tower

      Comment


        #4
        correct
        ..........
        Joon, Kathy, Jaden & Tristan
        93 3058
        92 2855
        91 Fourwinns 205
        Longbranch WA
        Life is Good

        Comment


          #5
          you could put a mechanical gauge in temporarily, or check the sender with an ohm meter to see if it is at/near zero ohms with engine off. I would guess the sender has failed.

          Comment


            #6
            A quick test would be to disconnect the wire at the sender. Turn the key on and if the gauge reads zero this tells you the signal wire from sender to gauge is not grounded. If the gauge reads zero replace the sender. If the gauge does not read zero with the sender disconnected you have a wiring issue.
            Gibraltar, Mi.
            1986- 3870- Hino 175's - Just purchased May ,2017
            34' Tollycraft- sold
            88 26' Shamrock/ Diesel
            14' Zodiac Bay Runner

            Comment


              #7
              "wgander" post=821645 wrote:
              My oil pressure gauge pegs to high as soon as I turn on the ignition switch
              Sounds like it's grounding out, what does it do if you disconnect the sending unit?
              Dave
              Edmonds, WA
              "THE FIX"
              '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
              (.030 over-Vortec top end-part closed cooled)
              The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
              Misc. projects thread
              https://www.baylinerownersclub.org/f...56-gctid789773

              Comment


                #8
                I'd have to put it back in the boat to be sure but I think It reads 0 until I turn on the power, then it pegs all the way high, regardless of engine running or not, and whether or not the sender is connected.

                I suspect the gauge is shorting out because all the instrument wires are in one bunch, with just enough wire from the bundle to reach to ech instrument. If a wire was shorting out, I'd expect it to affect all the instruments.
                1998 Capri 1950CL
                3 Liter MerCruiser
                Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
                2 batteries with Combiner, Joystick Wakeboard Tower

                Comment


                  #9
                  I agree with Sunbird, disconnect the sender and see if it pegs. It's much more common, in my experience, that a sender fails than a gauge.
                  P/C Pete
                  Edmonds Yacht Club (Commodore 1993)
                  1988 3818 "GLAUBEN
                  Hino EH700 175 Onan MDKD Genset
                  1980 Encounter Sunbridge "Misty Blue" (Sold)
                  MMSI 367770440
                  1972 Chevrolet Nova Frame off Resto-mod in the garage
                  Boating on the Salish Sea since 1948

                  Comment


                    #10
                    I replaced the sender and it made no difference...
                    1998 Capri 1950CL
                    3 Liter MerCruiser
                    Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
                    2 batteries with Combiner, Joystick Wakeboard Tower

                    Comment


                      #11
                      Follow Up (Sorry for the delay, I thought I did this)
                      Had to replace the Oil Pressure Gauge. I must have accidentally shorted it out when changing light bulbs - not a lot of space to work behind the instrument panel.
                      1998 Capri 1950CL
                      3 Liter MerCruiser
                      Furuno 1622 Radar, Garmin echoMAP44dv, Si-tex ADF, Uniden Cl 2 VHF with Hailer,
                      2 batteries with Combiner, Joystick Wakeboard Tower

                      Comment


                        #12
                        Originally posted by wgander View Post
                        Follow Up (Sorry for the delay, I thought I did this)
                        Had to replace the Oil Pressure Gauge. I must have accidentally shorted it out when changing light bulbs - not a lot of space to work behind the instrument panel.
                        thanks for the follow up... too many times we never hear what the solution was to the problem, and so no one is able to learn from your issue.


                        NU LIBERTE'
                        Salem, OR

                        1989 Bayliner 2556 Convertible
                        5.7 OMC Cobra - 15.5x11 prop
                        N2K equipped throughout..
                        2014 Ram 3500 crew cab, 6.7 Cummins
                        2007 M-3705 SLC weekend warrior, 5th wheel
                        '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
                        Heavy Equipment Repair and Specialty Welding

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