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Thread: MFD

  1. #1
    RiverRat19405, im a rat in the water RiverRat19405's Avatar
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    Question MFD

    I was told that their is like a watch batt in the mfd or electric box to keep hrs stored every time i disconect the batt i lose hrs is this true ? or is my mfd bad? any help would be great thanks in advance RiverRat


  2. #2
    Bernie's Avatar
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    my understanding is that there is a capacitor that keeps the memory powered up .I may be wrong .Anyone?

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by RiverRat19405 View Post
    I was told that there is like a watch battery in the MFD or electric box to keep hrs stored
    every time I disconnect the batt i lose hrs
    is this true ? or is my mfd bad?
    When you disconnect the battery, the time-of-day clock will reset immediately. That is normal.

    The accumulated engine hours counter should NOT reset to zero, unless the battery is disconnected for a LONG time (weeks or months). Sometimes the MFD engine hour count seems to get reset to zero if the battery connection is jiggled when the battery is being connected.

    Is it the engine hours counter that you are concerned about, or the time-of-day clock?

    I don't know whether there is energy storage (a small battery, or a large capacitor) inside the MFD, or non-volatile memory (like flash memory) that doesn't need power. My guess is non-volatile memory.

    There is certainly nothing in the electrical box, other than the fuse for the MFD supply from the main battery.

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