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38xx hino buzzer buzzing!

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    38xx hino buzzer buzzing!

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Name:	11B2BAAE-C285-46F4-B580-346D3B988D36.jpeg
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ID:	411585 I changed my engine oil/ filter yesterday.

    On my starboard motor, after changing it the engine buzzer did not cut off after start up.
    Oil pressure good and temp low.

    I changed the oil pressure sensor just in case as it looked rusted and oil.

    When I remove the lower lead (in pic below) the buzzer stops.

    What is lower lead for??

    thoughts??

    Craig
    Nanaimo bc
    1987 bayliner 3818
    w/ 175 Hinos no Genny, but solar to run everything!
    10ft Livingston with centre console and 15hp on davits / winch

    #2
    It looks like a sending unit on one hand and a cap with a stud on the other. I can’t find it on the parts schematics or wiring schematics such as they are. The buzzer switch and pressure sending unit are separate. On mine the buzzer switch is the one on the near side pointing kinda toward the camera. I’d go look at my boat, but we are a few thousand miles away for a while. You could test it as a ground, which is what I think it is, by clipping a test light to the stud and touching the hot line at the alternator, then doing the same thing with the wire disconnected, then the clip on the wire only. It could be you pressure alarm switch decided it was done. Let us know what you find.
    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


      #3
      What Pete said...
      was the lower wire you removed 16AWG GREEN wire? If so, that is the ground path (12VDC -) for the buzzer.
      buzzer 12VDC + PURPLE wire comes from the ignition switch/ gauges.
      buzzer 12VDC - GREEN wire comes thru the NORMALLY CLOSED oil pressure switch.
      continuity/ohm tester will tell right away.
      Joon, Kathy, Jaden & Tristan
      Uniflite 42 AC, DD 671N
      93 3058 sold
      92 2855 (day boat)
      91 Fourwinns 205 (lake boat)
      Longbranch WA
      Life is Good

      Comment


        #4
        The switch facing the camera and farthest to the right is the switch. The pressure sender is just that a variable sensor. I broke the buzzer sensor taking the manicooler off and I'm pretty sure it was from a 70's vw bug I think. Brought the thing to Oreillys and the matched thread pattern then cross referenced. Was maybe $4
        1985 3870 175hp Hino's

        Comment


          #5
          Here is my take on this the lowest single wire item is filter by pass with that said I bet you installed filter backward that is why alarm stayed on after start up
          just thinking out loud best of luck
          Roy
          SE Alaska
          1988 3818
          EH 700
          Custom hard top enclosed

          Comment


            #6
            Originally posted by RDH3818 View Post
            Here is my take on this the lowest single wire item is filter by pass with that said I bet you installed filter backward that is why alarm stayed on after start up
            just thinking out loud best of luck
            Roy
            SE Alaska
            Good call!
            was wondering what that thing is at the bottom.
            if that's the filter bypass sensor switch, makes sense.
            Joon, Kathy, Jaden & Tristan
            Uniflite 42 AC, DD 671N
            93 3058 sold
            92 2855 (day boat)
            91 Fourwinns 205 (lake boat)
            Longbranch WA
            Life is Good

            Comment


              #7
              Makes perfect sense. I wonder why it doesn’t seem to show up on the electrical components microfilm. I found the darn thing on the oil filter slide. WTH? (Family show here)
              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


                #8
                Ruffeyder.

                will pull filter to see. Did not think that would be it since the pressure on the gauge is good..
                Craig
                Nanaimo bc
                1987 bayliner 3818
                w/ 175 Hinos no Genny, but solar to run everything!
                10ft Livingston with centre console and 15hp on davits / winch

                Comment


                  #9
                  EMBARRASSING!

                  Roy, you were right. I somehow put the filter in backwards!!!!! That was causing the alarm. Weird that the pressure on the gauge was ok.

                  Thank you!

                  Craig
                  Nanaimo bc
                  1987 bayliner 3818
                  w/ 175 Hinos no Genny, but solar to run everything!
                  10ft Livingston with centre console and 15hp on davits / winch

                  Comment


                    #10
                    The bypass will allow oil pressure, but chew your a$$ for having a clogged filter.
                    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


                      #11
                      Yup, by pass valve open, unfiltered oil going thru
                      Joon, Kathy, Jaden & Tristan
                      Uniflite 42 AC, DD 671N
                      93 3058 sold
                      92 2855 (day boat)
                      91 Fourwinns 205 (lake boat)
                      Longbranch WA
                      Life is Good

                      Comment


                        #12
                        No worries glade it all worked out enjoy your boat
                        I just finished two buddy helicopters time for me to move to my boat
                        cheers
                        Roy
                        1988 3818
                        EH 700
                        Custom hard top enclosed

                        Comment

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