Bow thruster battery on 340

Discussion in 'Electronics Q&A' started by HallOfDreams, Sep 14, 2019.

  1. HallOfDreams

    HallOfDreams Member

    37
    Sep 11, 2019
    2003 (2004 face lift) Searay 340 8.1L Mag. Outdrive.
    Mercruiser 8.1L 496 mag
    i just purchased an 04 340. I am getting battery alarms when using the thruster. I can’t seem to locate its battery? Or it charger. Does anyone know if they are separate? My other boats all were independent. If combined do you know if it is powered by boys or engine batteries?
    Thanks
     
  2. Gofirstclass

    Gofirstclass Well-Known Member

    Apr 20, 2010
    Tri Cities, WA
    1995 550 Sedan Bridge,
    2010 Boston Whaler 130 Super Sport,
    1981 Boston Whaler 130 Sport,
    CAT 3406C's, 580hp.
    In my boat the batteries (2) are right next to the thruster and are charged by a dedicated charger.

    This may be a stupid question, but have you looked where the thruster compartment is to see if they're there? If you have, and the batteries are not there, follow the power wires back from the thruster and they'll be at the other end.
     
  3. HallOfDreams

    HallOfDreams Member

    37
    Sep 11, 2019
    2003 (2004 face lift) Searay 340 8.1L Mag. Outdrive.
    Mercruiser 8.1L 496 mag
    Thanks.yes that was my first place to look. No batteries by thruster. I followed the lead back to as far as the rear cabin then they disappear. I am thinking it could an after market install although done very well.
     
  4. HallOfDreams

    HallOfDreams Member

    37
    Sep 11, 2019
    2003 (2004 face lift) Searay 340 8.1L Mag. Outdrive.
    Mercruiser 8.1L 496 mag
    Found it! Goes right back to main distribution panel! Has a huge inline fuse. This makes it fairly easy now to isolate and put its own battery in. But I think my assumption is right, it’s an aftermarket installation.
     
  5. Korkie

    Korkie Active Member GOLD Sponsor

    580
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Mine is a Sea Ray installed thruster and is wired exactly as you state. It gets it power from the port bank. I too get a battery alarm (continuous beep) when using it. I do not get this when the genny is running. If I feel I am going to need the thruster other than a couple of bump thrusts (i.e. wind, current, tight maneuvering, etc) I start the genny and have no alarms. Didn't start having the alarm til after port bank was 2+ years old.
     
  6. HallOfDreams

    HallOfDreams Member

    37
    Sep 11, 2019
    2003 (2004 face lift) Searay 340 8.1L Mag. Outdrive.
    Mercruiser 8.1L 496 mag
    Interesting thanks for the reply. Mine are wired to the starboard house batteries. My guess is the batteries are a bit worn. I am installing anywAy this winter 4 x 6v batteries as we go off hook a lot so that should help.

    Curious if having separate power source for the thruster was an optional extra
     
  7. Korkie

    Korkie Active Member GOLD Sponsor

    580
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Not sure. We are 2nd owners.
     
    HallOfDreams likes this.
  8. Jeremygavin

    Jeremygavin Well-Known Member

    Mar 6, 2012
    Cape Cod, MA
    2011 520 Sedan Bridge
    2016 Sea Ray 19 SPX OB
    2019 Walker Bay Generation 340
    Cummins QSM11s
    Mercury 150 Fourstroke
    Honda 40hp
    My 340da had a factory thruster and was wired as Korkie’s and I always got an low volt alarm when using it. I thought about a dedicated battery but it wasn’t that big of a deal and I only needed to use the thruster for a few bumps here and there so it was a non issue for me and wasn’t worth the work and upkeep of a dedicated battery bank.
     
    HallOfDreams likes this.
  9. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    1988 Proline Center Console - 90hp Mariner/Mercury
    1969 Boston Whaler
    Twin 8.1 V-drives
    My 340SDA had a bow thruster added and it was wired with a single dedicated battery in the forward sole storage along with the bow thruster (it was a 12V unit). If it is pulling from the batteries back in the engine compartment it certainly seems like a long distance for such a load. Along with the voltage drop across the extended run it has got to add a lot of stress on those banks.

    -Kevin
     
  10. HallOfDreams

    HallOfDreams Member

    37
    Sep 11, 2019
    2003 (2004 face lift) Searay 340 8.1L Mag. Outdrive.
    Mercruiser 8.1L 496 mag
    I would agree until I saw the cable thickness. The cables are just huge . But without doubt your set up is optimum and how my rinker 360 was set up.
     
  11. Korkie

    Korkie Active Member GOLD Sponsor

    580
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Kevin, that is quite true. Like Jeremy, usually only bump it unless bad cross wind. If I run the genny, alarm is not an issue no matter how long I use it. Not sure I would want battery under wear I sleep. Although probably fine, just feel uncomfortable.
     

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