Battery Switch Question

Discussion in 'General Discussion' started by 340Sundancer, Aug 11, 2015.

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  1. 340Sundancer

    340Sundancer Member

    33
    Aug 11, 2015
    Great Lakes
    2005 - 340 Sundancer
    Blue Hull
    V-Drives
    Generator
    Twin 8.1 MerCruisers
    Hello everyone, The beginning of the summer I purchased my first boat a 2005 - 340 Sundancer!! I have grown up around boats all my life, however this is my first! I've had a great time all summer with it and all is well! Except for the last 2 weekends, which leads me to my question.......regarding the battery and the cabin switches.

    I always keep the shore power plugged in while at the marina, and the last two weekends while out on anchor, the port battery seems to loose charge. I first noticed it when I went to start the port engine up and nothing happened. I had to use the emergency switch to draw from the starboard battery to start the port. Not thinking too much of it, I came back to the marina and plugged her in and left for the week. The second weekend the same thing happened. So this is my question. While out on anchor, what should I be shutting off on the breakers......should I be shutting down the port batteries and just run on the starboard for the stereo, head, accessory, fridge, ect... I believe the starboard batteries are the "house" batteries correct?

    Any help would be great! Thanks!!!!
     
  2. Jaay757

    Jaay757 Member

    137
    Jun 18, 2012
    Buzzards Bay, Mass
    2006 sea ray 340 sundancer
    8.1's, ZF IV V drives
    The port side starts your port motor, generator and house. The port are usually the first 2 to go due to the constant drain and recharge. Prob time to replace. I do not shut off any breakers/batt switches while on anchor. Are you getting a second beep when starting your port motor even when it's charged, if so its time for new batteries.
     
    Last edited: Aug 11, 2015
  3. JimT

    JimT Well-Known Member SILVER Sponsor

    Jul 7, 2009
    Charlotte, NC- LKN
    2010 330 Sundancer
    T-350mags w/BIIIs & Axius, 5.0 kw Kohler
    Is your battery charger working? How long were you at anchor with the accessories running? How old are the batteries? If your battery charger is working and you have not had this problem until recently you probably have a bad battery.
     
  4. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
    I agree... maybe time to get new port batteries.

    Welcome to CSR!
     
  5. 340Sundancer

    340Sundancer Member

    33
    Aug 11, 2015
    Great Lakes
    2005 - 340 Sundancer
    Blue Hull
    V-Drives
    Generator
    Twin 8.1 MerCruisers
    Yes the battery charger is working. We were on anchor for about 4-5 hours.
     
  6. 340Sundancer

    340Sundancer Member

    33
    Aug 11, 2015
    Great Lakes
    2005 - 340 Sundancer
    Blue Hull
    V-Drives
    Generator
    Twin 8.1 MerCruisers
    Thanks! In the manual Doesn't it show that the starboard batteries start the generator? Maybe I'm wrong. Thoughts?
     
  7. Jaay757

    Jaay757 Member

    137
    Jun 18, 2012
    Buzzards Bay, Mass
    2006 sea ray 340 sundancer
    8.1's, ZF IV V drives
    You would think so as I did. Try to start your generator when your port side are dead to charge them, it will not start.
     
  8. FootballFan

    FootballFan Well-Known Member

    Jun 20, 2012
    Florida
    Marquis 59
    MTU Series 60
    The time you are anchoring doesn't sound like a problem. Since you know the charger is work - I would tend to think batteries are going. When were they last replaced?

    Mark
     
  9. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    Best thing to do is remove the motor battery from the circuit and add a second or third house battery
     
  10. 340Sundancer

    340Sundancer Member

    33
    Aug 11, 2015
    Great Lakes
    2005 - 340 Sundancer
    Blue Hull
    V-Drives
    Generator
    Twin 8.1 MerCruisers
    Ok so I checked all the water levels in all 4 batteries and they are all full and topped off and look good and very clean. I also found out that the batteries were last replaced in 2010 or 2011. So again another question.
    Since there is only about 1.5 months left of the boating season here in Michigan, should I buy 1 new battery and put it on the port side for the rest of the season to "help" my problem? Or secondly, should I replace all the batteries now but then my concern is that 4 new batteries will sit all winter OR......should I just wait it out and chance it for the rest of the season and of coarse replace all 4 batteries in the spring?

    Thanks guys....let me know!
     
  11. dpmulvey

    dpmulvey New Member

    Dec 19, 2007
    Homeport: Charles City, VA
    1999/2007 330 Sundancer Hardtop.
    6.2 Merc Horixons
    1.5:1 Velvet Drives
    One month= four weekends. I'd risk it and get a jump pack. Have a rewire done to isolate the port engine and use the house batteries for house alone.

    Same piss poor design on SR part is in Saint Max
     
    Last edited: Aug 12, 2015
  12. JimT

    JimT Well-Known Member SILVER Sponsor

    Jul 7, 2009
    Charlotte, NC- LKN
    2010 330 Sundancer
    T-350mags w/BIIIs & Axius, 5.0 kw Kohler
    Replace all four batteries now. They will do fine over the winter if they are stored properly.
     
  13. dpmulvey

    dpmulvey New Member

    Dec 19, 2007
    Homeport: Charles City, VA
    1999/2007 330 Sundancer Hardtop.
    6.2 Merc Horixons
    1.5:1 Velvet Drives
    Except he needlessly consumes warranty time.
     

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