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Replacement API 20025 alternator

Discussion in 'Ask A Hunter Owner' started by Brinky63, Mar 16, 2019. Add this thread to a FAQ

  1. Brinky63

    Brinky63

    Joined Oct 14, 2017
    50 posts, 2 likes
    HUnter 306
    Ar Aruba
    I have a API 20025 alternator installed on my yanmar 2gm20f which has three batteries, one starter for the engine, one operations and one starter for windlass and head.

    I keep my batteries charged using a battery charger while at the dock so the alternator is only used to maintain the batteries while i'm out on the water enjoying the boat. No solar panels or wind generators.

    What are my alternatives to changing this model or do I just get the same one? I am leaning towards a simple Napa alternator which half the amps but can do the trick. Just noticed that the connectors are a bit different.

    Any thoughts are welcome.
     

    Attached Files:



  2. Pearson 39-II

    Pearson 39-II

    Joined Aug 4, 2018
    50 posts, 19 likes
    Pearson Yachts 39-II
    Scotch Bonnet US Punta Gorda, FL
    Pardon, but why replace your alternator at all? What is the problem and what do you hope to achieve in the replacement decision?
     


  3. DayDreamer41

    DayDreamer41

    Joined Oct 29, 2016
    1,232 posts, 609 likes
    Hunter 41 DS
    Un Port Huron
    If it ain't broke don't fixit, if it is broke fix it right. Automotive style alternators are not suitable for marine applications, you may want to do a bit of research on the musing of mainesail a resident expert on boat charging system here at SBO.
     


  4. Brinky63

    Brinky63

    Joined Oct 14, 2017
    50 posts, 2 likes
    HUnter 306
    Ar Aruba
    the unit is overcharging the batteries, it's output can run to 16 volts with two batteries connected.
     


  5. SycloneDriver

    SycloneDriver

    Joined Jul 23, 2009
    134 posts, 23 likes
    Beneteau 88 First 285
    US Grand Lake, Oklahoma
    Take it to an alternator shop and have it repaired.
    It probably just needs a new voltage regulator, you could do that yourself.
    Many auto parts shops will test alternators for free.
     


    Pearson 39-II likes this.
  6. DayDreamer41

    DayDreamer41

    Joined Oct 29, 2016
    1,232 posts, 609 likes
    Hunter 41 DS
    Un Port Huron
    You could xonvert it to an external regulator
     


  7. Pearson 39-II

    Pearson 39-II

    Joined Aug 4, 2018
    50 posts, 19 likes
    Pearson Yachts 39-II
    Scotch Bonnet US Punta Gorda, FL


  8. Hunter Ad Bot

    Hunter Ad Bot

    Joined Oct 27, 2016
    0 posts, 12 likes
    US Seattle
    Deck fill caps for most Hunter sailboats

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