Sundancer 240 (1999) engine alarm problem. Help

Discussion in 'Sport Boats' started by Colin lighten, Jun 3, 2020.

  1. Colin lighten

    Colin lighten New Member

    6
    Sep 14, 2014
    Uk
    1999
    5 ltr
    hi, my alarm is going off as soon as you start the engine. Looking at the wiring manual seems to be two sensors/switches that combine that can set alarm off. As engine is cold and oil pressure gauge is good, I assume i have just a switch or wiring problem. Can anybody help the diagnosis and how to fault find it. One question, I had the outdrive oil changed in the winter, but I assume the oil pressure switch is measuring the main engine
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    The other thing that will sound the alarm in your setup is the drive fluid. Check the bottle and/or the float switch inside. Disconnect one of the bottle's wires, if you want to, to double check.
     
    Chris-380 likes this.
  3. Scott Clark

    Scott Clark New Member

    3
    Jul 31, 2017
    2004 220 Select
    5.0L
    Mine does this every year, dealer says that after changing outdrive oil it gets an air bubble in the system, after it burps your oil is just below the fill line. Just pour in a few oz.'s of oil and alarm will go away
     
  4. Jon Porter

    Jon Porter New Member

    17
    Jun 8, 2020
    Moyock NC
    2001 Ray Weekender 225
    5.0L Mercruiser Alpha One
    My factory depth sounder alarm was messed with unknown to me and that really threw me for a loop on my first trip of engine trials when you are waiting for something to go wrong! I agree with the gear oil alarm. You can disconnect the wires to the gear oil bottle and connect them with a small piece of wire to jump out the switch. That will trick the computer into thinking the switch is closed and satisfied and not give an alarm. This will at least isolate the issue quicker. Then return to normal setup after you determined the issue.
     
  5. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Just an FYI... you don't have to jump it. Just disconnect one of the wires to deactivate the sensor.
     
  6. Jon Porter

    Jon Porter New Member

    17
    Jun 8, 2020
    Moyock NC
    2001 Ray Weekender 225
    5.0L Mercruiser Alpha One
    Good to know, so it’s a NO (normally open) switch then.
     
  7. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Correct.
     

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