2002 340 sundancer battery switches

Discussion in 'Announcements & FAQs' started by dennisb84, Jul 13, 2015.

  1. dennisb84

    dennisb84 New Member

    3
    Jul 13, 2015
    long island
    2002 340 Sundancer
    8.1 v drives
    Something mysterious happened. I had no DC Voltage, and couldnt start either engine. I pressed up on the battery switches but the dc volt meter on the panel showed no volts. After getting towed back to the dock, I tried one more time, and it fired up as normal, showing 14 dc volts, and motors fired right up as normal. Anyone have any ideas? Thanks
     
  2. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    loose battery cables?
     
  3. dennisb84

    dennisb84 New Member

    3
    Jul 13, 2015
    long island
    2002 340 Sundancer
    8.1 v drives
    I checked . nice and tight. went to the boat today, all appears normal. I hate intermittent gremlins.
     
  4. dennisb84

    dennisb84 New Member

    3
    Jul 13, 2015
    long island
    2002 340 Sundancer
    8.1 v drives
    If the batteries go dead, do the Solenoids open, shutting down the batteries?
     
  5. rcknecht

    rcknecht Active Member

    Mar 23, 2009
    toms river,nj
    340 Sundancer 2001
    T 454 MPI
    Were your gear shifts not in neutral? That will prevent your engines from starting...
     
  6. murf 1

    murf 1 New Member

    24
    Jan 18, 2011
    rhode island
    03 240 sundancer, 2007 280 dancer, 2005 320
    5.0 mercruiser w/ bravo III , twin .5.0 now 6.2 mpi merc,'s
    I had a similar problem on my old 240 sundancer it was the slave solenoid on top of the engine..easy fix for me
    had a dead spot when turning the key.
     
  7. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    the "system power" starts at the main battery cable connection at the starter.
    From there depending on mercruiser the power goes thru a 90A fuse link and then goes thru the 50A circuit breaker. thru the main engine harness plug, up to the dash.
    A Fountain I just did had the system power and the alt feed together at the 90A fuse block. Redone to only have the alt feed at the block and system power directly to the battery lug on the starter
     
  8. fc3

    fc3 Just another eclectic geek TECHNICAL Contributor

    Nov 12, 2006
    Northern NJ
    1999 Sea Ray 330DA
    Twin 7.4 MPI (310 propshaft HP) V-drives
    Twin Mercury Marine marinized 7.4L L-29 V8s
    Cast iron block w 4-bolt mains
    Dirty contacts on the battery switch solenoids? Were the indicator lights on the battery switches illuminated? Did you try cycling the switch off to on and back several times?
     
  9. be_prepared

    be_prepared Active Member GOLD Sponsor

    237
    Oct 12, 2015
    Mattapoisett, MA
    2002 Sea Ray Sundancer 340DA
    Twin Mercruiser Horizon 8.1 inboards
    I had a strange starting problem on my 2002 340DA with the same engines, Mercruiser Horizon 8.1's. When the boat was surveyed, and the engine surveyor was pulling codes off the engines, he disconnected the wiring harness. When we later that day were heading out for a sea trial, one of the engines wouldn't start on it's own battery. It would start using emergency start, then stop once you let go of the emergency start button. Apparently when he put the harness plug back together, it didn't seat properly. He knew right what to look for, and said it wasn't that uncommon to have to jiggle them. It happened again this weekend, and I knew what to do... but it's not the most confidence inducing activity. Whenever we are heading out and "she who must be obeyed" sees the engine hatch being opened and I do anything other than a cursory scan of the bilge, I get that look, you know what I mean. My plan when I have some tinkering time on the boat is to disconnect both harnesses, use electrical cleaner on them, and then reassemble them with dielectric grease. I also am going to look at the hose clamps that are wrapped around them to make sure they are securing the plugs together properly. Incidentally, when this happens, you can hear the battery solenoid click when you try to energize it on the panel in the cabin, but no voltage shows on the meter. Sounded similar to your situation. Intermittent electrical problems are so frustrating.
     

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