Battery Alarm but batteries fine

Discussion in 'Electronics Q&A' started by John Paul, Jul 14, 2019.

  1. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
    one of our two engines will not start; battery alarm but all batteries new and connections clean. Emergency start bridge changes nothing; no power when turn key to start engine over battery alarm. Is there a major fuse somewhere? All power otherwise is fine to all areas and accessories.
     
  2. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    Do the gauges "come alive" ?
    Shifter in Neutral ?
     
  3. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
    Yes. The gauges come alive and show all OK except the battery for one of the two engines. I did check to make sure in neutral.
     
  4. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    Assuming it was running correctly and you didnt do any work on it then suspect the battery connected to that engine. Also check the connections at the starter and the block
    Being a twin you should have independent systems with a battery for each engine.
    post a pic of the engine, if you dont know what/where a slave solenoid is.
     
  5. barros1389

    barros1389 New Member

    23
    Sep 6, 2011
    Boston
    1999 Searay 215 EC, 5.0L -- sold
    2008 Searay Sundancer 280, Twin 5.0L MPI
    5.0L Mercrusier w/Bravo III
    If you have an MPI, check to see if you have a 50amp fuse on the top of the engine. Mine appears to have a red button that trips the fuse. When it's tripped there is a little yellow arm under the fuse that needs to be reset. Otherwise it's most likely the starter fuse. I've tripped both at various times. Getting to my starter fuse is impossible. I had a friend merc mechanic replace it for me blindly because you can't see anything at the back of the engine.
     
    Little Ducky likes this.
  6. barros1389

    barros1389 New Member

    23
    Sep 6, 2011
    Boston
    1999 Searay 215 EC, 5.0L -- sold
    2008 Searay Sundancer 280, Twin 5.0L MPI
    5.0L Mercrusier w/Bravo III

    Also check that your safety switch up at the helm isn't tripped.
     
  7. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
    Thanks. The 50 amp fuse on top of the engine is not tripped so it may be the starter fuse. The gauge shows low voltage Fault number 209. I will upload photos.
     
  8. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
  9. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
    A34C1C12-5A6D-4E87-A042-281443F3A014.jpeg Dual Merc 350s. I do not see the starter.
     
  10. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    click to enlarge
    the off white square plastic block is the 90A
    [​IMG]
     
  11. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    For a quick test if its blown, check for 12v at the orange alt output wire
     
  12. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
    Turns out the starter fuse was not blown; merely corroded. Once we replaced that fuse and cleaned all the wires of corrosion, everything worked well. Interestingly, the power gauge showed plenty of amps getting to the engine until the key was turned to start the engine (to power the starter). Then the amps dropped.
     
  13. John Paul

    John Paul New Member

    8
    Jul 14, 2019
    Sea Ray 300SLX
    Dual Merc 350
    5FBC591A-E089-4C7D-8D72-B42FD7A149CE.jpeg
     

    Attached Files:

  14. Korkie

    Korkie Active Member SILVER Sponsor

    554
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Did you check the other motor as well?
     

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