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speedometer -- what is this thing?

Discussion in 'The Garage' started by DogBunny, May 21, 2020.

  1. DogBunny

    DogBunny Motorcychologist Top Contributor

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    What is the black plastic rectangle in the middle of some speedos? How do you test it? If you put 12 volts to it, you destroy it.
     
  2. 5twins

    5twins XS650 Guru Top Contributor

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    I think that's the sensor for the turn signal canceler but I'm not sure how to test it.
     
    DogBunny likes this.
  3. DogBunny

    DogBunny Motorcychologist Top Contributor

    Thank you, I think you're right. If that's what it is, how does it cancel the turn signal? And why in the world is it in the speedometer?
     
  4. 5twins

    5twins XS650 Guru Top Contributor

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    I'm not sure how it works, somehow senses distance traveled I think. But that being said, on the several bikes I've had with it, it doesn't work very well. It's very inconsistent, sometimes functioning as it should, sometimes canceling the signal seemingly too early, lots of times not canceling it at all. Thankfully the signals also have that "push to cancel" feature on the button. I use that most of the time because, well, I have to, lol. The signal doesn't cancel on it's own.
     
    DogBunny likes this.
  5. DogBunny

    DogBunny Motorcychologist Top Contributor

    If it worked by sensing distance traveled, that sure would explain why it's in the speedo housing.
    Don't know why I never wondered about that thing before. I've destroyed countless of those sensors over the years by putting 12 volts to them.
     
  6. 5twins

    5twins XS650 Guru Top Contributor

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    Why would you do that, and after destroying one, why would you continue to do it?
     
    kshansen and DogBunny like this.
  7. DogBunny

    DogBunny Motorcychologist Top Contributor

    When you put it like that, it does sound pretty dumb, doesn't it. I guess it's repeated forgetting the last time I ruined one. You test the gauge lights, then you just naturally move on to the next pin in the connector. I promise not to do that any more.
     
    GLJ likes this.
  8. Team Junk

    Team Junk XS650 Junkie XS650.com Supporter Top Contributor

    It's a reed switch triggered by a magnet in the speedo. To test it put a ohm meter on it and turn the speedo cable. As the magnet passes the switch it should alternate between shorted and open.
     
    JAX71224 and DogBunny like this.
  9. DogBunny

    DogBunny Motorcychologist Top Contributor

    Excellent.
     
  10. RonXS

    RonXS XS650 Addict

    As I remember - and this is a very dusty neuron - A timer is involved above a certain speed. Below a set speed (including stopped) they would cancel based on distance. Above the speed setting (freeway speeds) they would cancel based on time (maybe 20 sec?). I don't remember the specifics. Not enough to bet on anyway.
     
    DogBunny likes this.
  11. DogBunny

    DogBunny Motorcychologist Top Contributor

    RonXS likes this.

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