336 Alternator Replacement

Discussion in 'Ask A Hunter Owner' started by rachelmackenzie, May 17, 2019. Add this thread to a FAQ

  1. rachelmackenzie

    rachelmackenzie

    Joined Sep 4, 2010
    68 posts, 0 likes
    Hunter 336
    US Maquam Shore, VT
    The alternator on our 1995 336 has breathed its last breath. The captain is contemplating replacing the 55 amp with an 80 amp. Has anyone done this? Thoughts about it? Apparently the main concern seems to be if wires will melt....
     


  2. Maine Sail

    Maine Sail Moderator

    Joined Feb 6, 1998
    10,990 posts, 774 likes
    Canadian Sailcraft 36T
    US Casco Bay, ME
    We really need a lot more info about how you use the boat, how big the bank is etc...

    Also Hitachi dropped these alternators, they're no longer even made, and the only replacements are now cheap Chinese units that don't compare to the original Hitachi. Unless you want to source the components and build one yourself don't count on a replacement 80A lasting very long if a 55A genuine Hitachi has already died.

    Here are a couple of links to get you started and on the way to understanding how to undertake a project like this:

    Automotive Alternators and Deep Cycle Batteries (LINK)

    Marine Alternator Installation - Tips & Tricks (LINK)


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  3. rachelmackenzie

    rachelmackenzie

    Joined Sep 4, 2010
    68 posts, 0 likes
    Hunter 336
    US Maquam Shore, VT
    I'm not sure of the battery capacity, but I can get that info. We don't do a lot of motoring, just when we anchor or approach the mooring. Usually about 30 minutes for a day-sail all said and done. We cruise the lake about three weeks of the year, those days probably have a good hour or so of motoring per day. A couple old solar panels help top off the batteries (I can get info about them). LED lights inside, no refrigeration. The biggest battery drain is probably running the radio or charging phones (usually when the motor is running--a mad scramble by the kids to get to the chargers first!).
     


  4. rachelmackenzie

    rachelmackenzie

    Joined Sep 4, 2010
    68 posts, 0 likes
    Hunter 336
    US Maquam Shore, VT
    We have two group 29 batteries and 10 watt solar panels.
     


  5. Benny17441

    Benny17441

    Joined May 24, 2004
    5,808 posts, 436 likes
    CC 30
    US South Florida
    If it were me, I would take the 55A Hitachi to an electrical shop and have it repaired or rebuilt. For some other things I may consider them cheap replacements but not for the alternator. Forget about getting an extra 25A of clean charging power these replacements are less efficient.
     


  6. Hunter Ad Bot

    Hunter Ad Bot

    Joined Oct 27, 2016
    0 posts, 13 likes
    US Seattle
    Deck fill caps for most Hunter sailboats

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    Stainless, nylon, in all the shapes and sizes, replacement caps are in stock.
    See the product
     


  7. DayDreamer41

    DayDreamer41

    Joined Oct 29, 2016
    1,346 posts, 674 likes
    Hunter 41 DS
    Un Port Huron
    If you are interested I have an 80A Hitachi I just took off our 41DS could be had for a less that rebuilding.
     


  8. AlexB

    AlexB

    Joined Aug 9, 2016
    32 posts, 9 likes
    C&C 36
    US Great Kills harbor.
    what exactly is wrong with with alternator they are easy to to fix.
    and B+ wire just double to be safe.
     


  9. rachelmackenzie

    rachelmackenzie

    Joined Sep 4, 2010
    68 posts, 0 likes
    Hunter 336
    US Maquam Shore, VT
    My husband decided to purchase a new one. Thanks for the advice!