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    Cummins alternator

    Hi all. Does anyone have the part number for the 330 Cummins alternator ? Mine quit changing today. I have 12.7 at the battery and 3 volt at the positive terminal at the back of the alternator. Thanks Dave

    #2
    sbmr.com will have it

    KEVIN SANDERS
    4788 DOS PECES - SEWARD ALASKA - LA PAZ BCS MEXICO


    Whats the weather like on the boat
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      #3
      It is a standard Delco alternator - should be able to get it rebuilt pretty much anywhere.

      If semi-local to Kent, WA "Rebuilder" on Central has done right by me on a few things this year. Usually a day or two turnaround.
      1999 Sandpiper Pilothouse - Current
      1989 3888 - 2011-2019, 1985 Contessa - 2005-2011, 1986 21' Trophy 1998-2005
      Nobody gets out alive.

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        #4
        I bought what was supposed to be the correct model from a general internet supplier. Was 100% wrong... Whereas everything I have bought from sbmar has been an exact replacement.
        Current: 1998 Bayliner 4085 - Cummins 6BTA 370's
        Past: 2004 Monterey 322 - Volvo 5.7 GXi's
        Past: 1987 Silverton 34X - Crusader 454's

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          #5
          I'd check wiring. The positive terminal at the alternator, engine running or not should be the same as at the battery. That wire either goes to an isolator or ACR and then to the terminal on the starter which is where the big cable from the battery is connected. Hard to imagine how voltage would be any different at the alternator than the battery without something wrong in between.
          Tony Bacon,
          Washougal, WA
          Caspian, MMSI 338355743
          1997 3788 Cummins 250hp

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            #6
            Click image for larger version

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ID:	652703 Click image for larger version

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ID:	652702 Dave, you need a Delco-Remy Si19 equivalent. I’m attaching a couple of pics. I bought mine a while back from Spider Marine. You can get the number off the label in the pic (if they are still in business 🤭). It’s important that the top of it has the full width anchor point (see the other pic) that the bolt fits thru! Search thru Google and check the pics to see you have the right one. I think the standard unit was 105amps.

            Good luck! Cheers

            John H
            Brisbane QLD Aust
            "Harbor-nating"

            2000 - 4788/Cummins 370's

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              #7
              Thanks for the response everyone. I found the charging issue the terminal on the alternator was rotted.

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                #8
                The original Delco 19si was 105amps, I was searching on the internet yesterday and it appears there is now a 135amp drop in replacement. Looking to upgrade but likely will go with even larger HD unit to get more amps at low rpms.
                Graeme
                1999 Bayliner 4788, twin Cummins 330's
                Confirmed Aquaholic
                Newmarket, Ontario

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                  #9
                  John just wondering why the ground wire on the alternator?

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                    #10
                    Originally posted by capt.dls View Post
                    John just wondering why the ground wire on the alternator?
                    I have no idea Dave. I’ll look to see where it leads! Cheers
                    John H
                    Brisbane QLD Aust
                    "Harbor-nating"

                    2000 - 4788/Cummins 370's

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                      #11
                      This is what I've been using for several years. It's what sbmar.com sells. search the part number you can find it online cheaper.
                      Attached Files
                      Island Girl 2000 3988
                      Great Loop 2018
                      Sarasota,Florida
                      There are worse places to be than on your boat.

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