Intermittent Alarm - Bad Sensor?

Discussion in 'Sport Boats' started by seanmclean, Aug 28, 2017.

  1. seanmclean

    seanmclean Member

    33
    Jun 13, 2017
    NJ
    '03 182
    4.3Merc
    2003 SeaRay 182, 4.3 Merc I/O

    Over the last few weeks I have been getting an intermittent alarm while underway (less than one second, more like a beep), generally when making a significant turn, or when bow is up coming onto plane. Oil Pressure (and level) is fine, operating in normal temp range, and gear oil is full (and freshly changed). As far as I know, those are the only three conditions that trigger the buzzer.

    Given that its random and just for a second or less, I'm inclined to think that its a sensor issue. Does anyone have a diagram of the sensor locations on the 4.3 Merc? Any other ideas that I could chase down?
     
  2. LawyerMan

    LawyerMan Member

    425
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    A bad sensor is one of the hardest things to diagnose. One thing you might try (I had this problem and posted about it in a different thread on here). My symptoms were similar to what you described. It ended up being the float inside the gear oil reservoir. The float inside was filled with gear oil and would sometimes sink to the bottom of the reservoir, throwing off an alarm. If that's it, it's a very easy fix. I would start there.

    EDIT: Here is my old post - http://www.clubsearay.com/index.php?threads/496-mag-nagging-alarm-problem-solved.76199/
     
  3. seanmclean

    seanmclean Member

    33
    Jun 13, 2017
    NJ
    '03 182
    4.3Merc
    Thanks, cleaned mine up today, and in the process I found that one of the two quick connects on the sensor was barely plugged in. Perhaps that will do the trick.
     
  4. seanmclean

    seanmclean Member

    33
    Jun 13, 2017
    NJ
    '03 182
    4.3Merc
    Two days on the water, no beeps :)
     
  5. LawyerMan

    LawyerMan Member

    425
    Jul 12, 2012
    Texas Gulf Coast
    270 SLX w/ Sport Arch
    496 Mag DTS, Bravo III, Corsa
    That's a great feeling! I'm happy it's fixed for you.
     
  6. Searayguy185

    Searayguy185 Member

    76
    Jul 17, 2017
    Wisconsin
    2004 Sea Ray 185 Sport 4.3 V6,

    2008 Toyota Highlander Sport
    Mercruiser 4.3 V6, Alpha 1 Generation 2
    Where are the connections located? Did yours make a single "beep" or two "beeps"?
     
  7. seanmclean

    seanmclean Member

    33
    Jun 13, 2017
    NJ
    '03 182
    4.3Merc
    Coming off the gear lube container, about 6-8" down.

    Was usually just one beep/chirp. Nothing since then, did a 40mi cruise yesterday (long way for a little boat), and not a single beep.
     
  8. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Coincidental, for sure, a closed circuit to ground would cause the beep, an open circuit, like a disconnected wire, would make that circuit never beep
     
  9. seanmclean

    seanmclean Member

    33
    Jun 13, 2017
    NJ
    '03 182
    4.3Merc
    Perhaps, depends how it is wired, normally open or normally closed. Float switches can go either way.
     
  10. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    Scof is correct - if one of those bullet connectors was not plugged in, it would nullify the alarm system.
     
  11. Searayguy185

    Searayguy185 Member

    76
    Jul 17, 2017
    Wisconsin
    2004 Sea Ray 185 Sport 4.3 V6,

    2008 Toyota Highlander Sport
    Mercruiser 4.3 V6, Alpha 1 Generation 2
    Mine periodically beeps as well. I unhooked the connection for the temp sensor on the thermostat. Thinking that’s why it’s beeping. I took it out briefly and so far no beeps. My question is by having that temp sensor unhooked would that turn off the whole alarm system. When the key is turned to the on position it makes the alarm sound.
     

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