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1987 3.0L MerCruiser Alternator

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  • 1987 3.0L MerCruiser Alternator

    Tback of my alternator fell off.
    After looking at mercruiserparts.com I came up with 5 different possibilities they are all out dated, I cross referenced part numbers and iboats.com has a few to choose from starting at 168.99 to 201.80 they were Sierra 68 amp, Arco 105 amp & Mallory ? amp.
    I also found on ebay.com a Delco 110 amp that matches for 69.00.
    All alternators are marine, is there a reason I should not get the Delco?

  • #2
    Re: 1987 3.0L MerCruiser Alternator

    Why do you need such a big alternator for a 3.0L? You do realize that the bigger the alternator, the more HP it takes from the engine to run it.

    As long as the mounting for the alternator is the same, you can use the larger Delco, just be sure to use a larger orange wire to the starter. It is only 8 ga now, sized for the 50 - 65 amp range.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

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    • #3
      Re: 1987 3.0L MerCruiser Alternator

      Ok thanks the wire broke when it fell so I will have to change it anyway.
      6 ga should be enough right?
      How much of a differance would it make in the HP?
      Since the Sierra was 65 amp and the Arco was 105 amp I was not sure if it would make a big differance, as to the useage I dont evan have a radieo right now but if I can save $100.00 to $200.00 I think it would be worth it.

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      • #4
        Re: 1987 3.0L MerCruiser Alternator

        Take your alternator to your local starter/alternator/electric motor shop. They can probably fix your alternator cheaper than any dirt cheap off shore high amp alternator. And it will probably last longer ................ if you don't drop it.
        Don S.


        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

        Comment


        • #5
          Re: 1987 3.0L MerCruiser Alternator

          LOL
          I was going to take it to someone but two of the wires for the stator are broken and the rotor has been rubbing stator pretty bad I think was rebuilt before and not done right.
          I guess I need to add checking the bolts holding the alternator together to my winterizing list.

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          • #6
            Re: 1987 3.0L MerCruiser Alternator

            if it was the one from "DB ELECTRICAL" on ebay, they are local to me, and I am running that alternator on my 1988 3.0

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            • #7
              Re: 1987 3.0L MerCruiser Alternator

              Originally posted by jeremy_nash View Post
              if it was the one from "DB ELECTRICAL" on ebay, they are local to me, and I am running that alternator on my 1988 3.0
              Yes that is the one I ordered.
              Did you use the origanal wiring?

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              • #8
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                Re: 1987 3.0L MerCruiser Alternator

                Originally posted by danielw71 View Post
                LOL
                I was going to take it to someone but two of the wires for the stator are broken and the rotor has been rubbing stator pretty bad I think was rebuilt before and not done right.
                I guess I need to add checking the bolts holding the alternator together to my winterizing list.
                Ok, then take it to a reputable rebuild shop so they can do it "right"!

                I'll bet there's more than one available.....
                1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
                Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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