Clock reset on new Vulcan 900

Discussion in 'Motorbike Technical Discussion' started by R-D-Lorance, May 16, 2006.

  1. R-D-Lorance

    R-D-Lorance Guest

    I just bought a new 900 Vulcan several days ago. So far it has been
    great with one minor exception: When I turn the bike off and let it sit
    overnight I notice my clock loses several hours. I know this sounds
    like a petty problem but I am wondering if it might be an indication of
    a future serious electrical problem. My theory is that for some reason
    the back up battery that keeps the chip that runs the clock powered up
    must be shutting down sometime when the engine is off. It is not a big
    deal to me if the clock isn't accurate but IF a computer module screws
    up sometime in the future because of this and leaves me stranded. . .
    that would ruin my day. I know there aren't many of the 900 Vulcans on
    the road yet but I am just curious if any of you have had a similar
    R-D-Lorance, May 16, 2006
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  2. I've never come across a bike that has a back-up battery for the clock.
    You disconnect the battery; the clock goes dead. That's always been my

    I really doubt that something as basic as a clock is controlled by a
    chip. Much more likely that there's a simple wiring connection fault.
    The Older Gentleman, May 16, 2006
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  3. Sometimes these days, 'battery' is spelt 'condenser' (or 'capacitor',
    depending on geographical location). The OP doesn't say explicitly, but
    gives the impression that the clock doesn't go completely into reset mode
    but retains some state ("loses several hours"); it'd help diagnosis if
    it was verified whether the clock stopped at the time the ignition was
    switched off, ran for some time past that, or continued to run at a
    reduced rate with ignition off.
    Consider how your Mac works; a small "battery"-backed module maintains
    the time when the machine is off and the computer reads this when it is
    booted, to set system time. Whilst running, the computer's time may be
    adjusted, either manually or via calls to an internet time-server; when
    the machine is shutting down it then writes its "accurate" system time into
    the module so that time is maintained while the computer is off. Standard
    mass-produced system parts, I bet they turn up in more computer-controlled
    systems than just PCs.

    I'd agree with you but I find it hard to imagine a wiring fault
    that only stops or slows the time-keeping rather than completely resetting
    the module.

    Ivan Reid, Electronic & Computer Engineering, ___ CMS Collaboration,
    Brunel University. [email protected][|] Room 40-1-B12, CERN
    GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005
    WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon)
    KotPT -- "for stupidity above and beyond the call of duty".
    Dr Ivan D. Reid, May 16, 2006
  4. Ye-es. I see what you mean. An odd one.
    chateau.murray, May 16, 2006
  5. R-D-Lorance

    Dave Brown Guest

    Why would you mess with electricals on a new bike that you obviously aren't
    customizing (assumed, of course, as your only concern is your clock losing

    Take it back to the dealer... fix it under warranty and be done with it.
    Dave Brown, May 16, 2006

  6. the right answer ;-))
    chateau.murray, May 16, 2006
  7. R-D-Lorance

    R-D-Lorance Guest

    I will have it checked out when I take it in for the 500 mile service
    next week. I was just hoping some of you might have had a similar
    problem so I could give my dealer a heads up. As far as I know my 900
    Kaw was one of the first dozen sold here in Lincoln, Nebraska so the
    dealer probably hasn't seen too many of them yet. Unless a service
    bulletin is out about this problem mechanics usually don't know what to
    look for.

    R-D-Lorance, May 16, 2006
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