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Wiring harness for 1993 Mercruiser v6 with balanced shaft and electric fuel pump

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  • Wiring harness for 1993 Mercruiser v6 with balanced shaft and electric fuel pump

    I'm trying to reuse the existing wire harness for the newly rebuild 1993 Mercruiser 4.3 with the balance shaft and electric fuel pump. What I have available is an older 1984 Mercruiser 4.3 without a balanced shaft harness and a 1993 mercruiser v8 5.0l harness. Neither of the older engines had an electric fuel pump and there are possibly some other electrical differences. Still I wonder if I can use any of these harnesses and which one would be a better match. Thx
    1998 Ebbtide 210 Campione, Mercruiser 5.0 V8, 1993 Larsen Sei 200 BR, Mercruiser 5.0 V8 1990 Bayliner 2050, Mercruiser 3.0LX 1984 Mercedes, OMC 3.8 V.6

  • #2
    Or make your own
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

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    • #3
      As near as I can make out the '93 5.0l is almost identical to the 4.3l. It's just missing the fuel pump circuits. It just needs a ground, an ignition supply running through an oil pressure switch and a wire running from the unused small terminal on the starter solenoid to the pump side of the oil pressure switch.
      "Growing old is mandatory. Growing up is optional."

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      • #4
        Yep, as AD said... Use the '93 and just run a few new wires for the pump...

        Chris.....
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        The world takes on a whole new perspective when viewed from 100’ below.
        1972 Bertram ‘Bahia Mar’ 20
        2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
        (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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        • #5
          I used the older harness and built the engine side while the motor was on a stand. Adding the electric fuel pump circuitry is easy that way. Don't forget a fuse. I also added a relay switched by both oil pressure switch and starter. The relay protects the oil pressure switch from directly powering a pump all the time.
          17 Foot '90 Bluewater
          Alpha 1 3.0 Merc - repowered in 2016
          now - 4.3L Vortec - Alpha 1 GenII
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          Engine custom - Transom 0D65328 - Drive 0D648864
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          • #6
            If you're adding a fuse and a relay that will be in the engine compartment don't forget to make sure that they're vapor proof (ignition protected).
            "Growing old is mandatory. Growing up is optional."

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            • #7
              Originally posted by wrench 3 View Post
              If you're adding a fuse and a relay that will be in the engine compartment don't forget to make sure that they're vapor proof (ignition protected).
              If you find a closed 20 amp mini blade fuse (ATC), please let me know where. Can't get them in Australia.
              xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
              The world takes on a whole new perspective when viewed from 100’ below.
              1972 Bertram ‘Bahia Mar’ 20
              2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
              (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


              Comment


              • #8
                I use thesehttps://www.iboats.com/shop/sierra-fuse-holder-inline-weatherprf.html
                They take ATO or ATC fuses and are rated for 30amps.
                "Growing old is mandatory. Growing up is optional."

                Comment


                • #9
                  Originally posted by wrench 3 View Post
                  I use these https://www.iboats.com/shop/sierra-f...eatherprf.html
                  They take ATO or ATC fuses and are rated for 30amps.
                  Yeah, that's the holder. I'm looking for the (mini) fuses themselves. Plenty of sites on flea-bay and the like CLAIMING to sell ATC, but when you quiz them, no, only ATO... I only run one value fuse on the engine (which is what I want the spares for) and that 20A. A 'mixed' pack is no good to me, since I only want 20A fuses. I know they are made, but re-sellers in Australia only carry ATO. Or 'marine dealers' who want over $10 each. That's just ridiculous!

                  Chris.....
                  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                  The world takes on a whole new perspective when viewed from 100’ below.
                  1972 Bertram ‘Bahia Mar’ 20
                  2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                  (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                  Comment


                  • #10
                    Bluesea lists one as ATO/ATC. I have an inquiry in to them now. I'll let you know if the reply is positive but I'm not too hopeful.
                    "Growing old is mandatory. Growing up is optional."

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                    • #11
                      Originally posted by wrench 3 View Post
                      Bluesea lists one as ATO/ATC. I have an inquiry in to them now. I'll let you know if the reply is positive but I'm not too hopeful.
                      Cheers and thanks
                      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                      The world takes on a whole new perspective when viewed from 100’ below.
                      1972 Bertram ‘Bahia Mar’ 20
                      2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                      (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                      Comment


                      • #12
                        Chris
                        I was going to send you a personal message but since we've already hijacked the thread.
                        I received this information from Bluesea:
                        "Mike,
                        Thank you for the question. This is a common misconception about automotive fuses. ATO is the brand name used by Little Fuse. ATC is the brand name used by Cooper Bussmann. We may use either brand depending on availability. The O or C has nothing to do with the construction of the fuse only the Brand the fuse was manufactured under. Both brands have almost identical characteristics but we want consumers to know you could receive either brand. Currently our stock is the Cooper Bussmann ATC’s."
                        I sent back asking if they were ignition protected and got this back:
                        "Mike,
                        Both brands are ignition protected. Here is the Bussmann page

                        You can get them here. (iBoats)
                        Blue Sea Systems ATO or ATC Marine Fuse, 20A, (2)IB00242475 $2.19$1.86
                        "Growing old is mandatory. Growing up is optional."

                        Comment


                        • #13
                          Originally posted by wrench 3 View Post
                          Chris
                          I was going to send you a personal message but since we've already hijacked the thread.
                          I received this information from Bluesea:
                          "Mike,
                          Thank you for the question. This is a common misconception about automotive fuses. ATO is the brand name used by Little Fuse. ATC is the brand name used by Cooper Bussmann. We may use either brand depending on availability. The O or C has nothing to do with the construction of the fuse only the Brand the fuse was manufactured under. Both brands have almost identical characteristics but we want consumers to know you could receive either brand. Currently our stock is the Cooper Bussmann ATC’s."
                          I sent back asking if they were ignition protected and got this back:
                          "Mike,
                          Both brands are ignition protected. Here is the Bussmann page

                          You can get them here. (iBoats)
                          Blue Sea Systems ATO or ATC Marine Fuse, 20A, (2)IB00242475 $2.19$1.86
                          Fantastic, thank you...

                          Edit: Just checked, those fuses look like 'regular' fuses, not 'mini'... Also, I checked and it seems your man is spinning you some...

                          Click image for larger version

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                          Last edited by achris; January 11th, 2019, 05:52 PM.
                          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                          The world takes on a whole new perspective when viewed from 100’ below.
                          1972 Bertram ‘Bahia Mar’ 20
                          2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                          (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                          Comment


                          • #14
                            achris I dunno if it's what your looking for but I though the minis were called ATM fuses. I get tons of availability on amazon, etc, when I search 20 amp atm fuses. Bussmann shows them as J1171 approved.
                            1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

                            Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
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                            • #15
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                              Originally posted by Mad Props View Post
                              achris I dunno if it's what your looking for but I though the minis were called ATM fuses. I get tons of availability on amazon, etc, when I search 20 amp atm fuses. Bussmann shows them as J1171 approved.
                              Thanks, I'll check it out... Here's the sizes of the fuses...

                              Click image for larger version

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Views:	1
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ID:	10695574
                              xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                              The world takes on a whole new perspective when viewed from 100’ below.
                              1972 Bertram ‘Bahia Mar’ 20
                              2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                              (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                              Comment

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