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Sea ray 340 Sundancer engines and gauges cut out for a second

Discussion in 'Sea Ray Yacht' started by Siesta Key, Aug 12, 2017.

  1. Siesta Key, Aug 12, 2017
    #1
    Siesta Key

    Siesta Key New Member

    Joined:
    Aug 12, 2017
    Messages:
    2
    Location:
    Siesta Key Florida 34242
    Hi, I have posted about this issue before but cant find the thread.
    I was hoping somebody may have some idea on a problem Im having
    with both engines cutting out for a split secound when on the plane
    I also hear the alarm bleep once
    All the gauges drop for a secound
    It can also happens at idle
    I own a 340 Sea ray sundancer 2006
    Twin 8.1 Mercruisers with V drives
    The boat also has Smart craft sc 5500
    Ive had advice on what will set the single beep alarm off
    but no luck on the engines quitting for a split secound and then runs normal
    I have had a diagnostics run and no error codes show up, all temps are fine
    Any thoughts would be appreciated
    Just had new risers and manifolds
    Oil change and new filters
    Also replaced the enginge start switch
    Not possitive both engines cut out but both engine gauges drop
    Thanks in advanced
    David
  2. Capt Ralph, Aug 12, 2017
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,727
    Location:
    Satsuma, FL
    Loose purple wire behind the dash.
    Its hard to explain why but sleray runs the ignition purple wire thru the dash thru many crimps before this hot wire goes to the engine.
    My last fix, I opened the dash and found where the purple wire enters and leaves the dash gauges. Ran a new wire between those two points and all was well.

    You will never find it with a DVM.
    At idle, give the dash a few good (real Good) slaps. It will skip.
  3. Siesta Key, Aug 13, 2017
    #3
    Siesta Key

    Siesta Key New Member

    Joined:
    Aug 12, 2017
    Messages:
    2
    Location:
    Siesta Key Florida 34242
    I'm heading to the boat today so will take a look
    If it is the purple wire would that make the engines cut out for a quick second?
    Also I have the Smartcraft so not sure if it would pass through it?
    Will give an update
    Thank you for your suggestion
  4. bliss, Aug 13, 2017
    #4
    bliss

    bliss Senior Member

    Joined:
    Oct 13, 2009
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    168
    Location:
    Racine
    Long ago I had a SR 34 and vaguely remember a similar problem. Anyway, you might try what worked for me (as I recall). Facing aft with the E room hatch open lie down, hanging over the open hatch and look forward under the floor. In my boat there were two fused wires, just under the floor. One fuse for each engine each in a plastic container. It turned out that one of the fuse containers kept disconnecting for just a moment. I replaced the container and all was well. Let us know what works Good luck!
  5. Capt Ralph, Aug 13, 2017
    #5
    Capt Ralph

    Capt Ralph Senior Member

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    12,727
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    Uh oh, you did mention smartcrap.
    My experiences above (#2) don't apply for this head ache.

    My history with smartcrap is the power leads to the control box as bliss is pointing to.
  6. Fishtigua, Aug 13, 2017
    #6
    Fishtigua

    Fishtigua Senior Member

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    2,936
    Location:
    Guernsey/Antigua
    Yep, I have to deal with this shyte daily. There maybe a 6-way or 4-way junction box gone bad. Happens quite a bit.

    As to the purple wire, thats your ignition live route, make sure it's clean and good.