270 SD - MX 6.2L MPI - loose tach wire by lube bottle

Discussion in 'Sport Boats' started by GoFastr, Apr 27, 2018.

  1. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    134
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Does anyone else have this loose tach wire by the gear lube monitoring bottle?

    Is this not supposed to be connected to something or at least capped off?
    Is it maybe only used to try and set the timing when hooked up to the scan tool in service mode?

    TAch1.jpg Tach2.jpg
     
  2. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    134
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Anyone?
     
  3. Espos4

    Espos4 Active Member

    327
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    I have the same wire on my 2007 350 mag.

    Same thing, it’s not connected to anything.
     
  4. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    134
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Thanks for the reply. Any idea was it is used for?
     
  5. Espos4

    Espos4 Active Member

    327
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    I’m not positive, but I believe it’s just an auxiliary tach signal.
     
  6. searay205

    searay205 Member

    37
    Nov 27, 2016
    Houston
    2011 Searay sport
    5.0MPI Catalyst
    Same as my 5.0 mpi. Disconnected, not used.
     
  7. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    134
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Thanks all.

    Guess I need to look somewhere else for my wandering gauge problems then.

    I have the little SmartCraft SC1000 System Monitor display but with all analog face gauges.
    The tach and speedo don't have an LCD display section or any buttons but they have SmartCraft quick link connectors as do the oil, water, volts, etc.

    The problem is that the needles for the tach and speedo just wander all over the place as if they are searching for something, similar to how they do when you first turn the key on. It's just that they keep wandering all over the place even with the engine running and all the time while I am out at sea.

    I asked the dealer to look into it and they said the SmartCraft SC1000 System Monitor display gauge was probably bad. I replaced it myself with a new one and all of the speedo and tach gauges are still doing the same thing. The temp, oil and volts gauges look to be reading ok. When cycling through the modes on the SC1000 Systems Monitor display gauge the tach, speedo and depth are all over the place but the water, oil and volts match the analog gauges and look ok.

    Helm Gauges_all.jpg OEM SmartCraft SC1000 System Monitor.JPG
     

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