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Instrument cluster

Discussion in 'XJ Technical Chat' started by Mark George, Oct 24, 2023.

  1. Mark George

    Mark George New Member

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    Hello from Wales I’ve got a xj750 Seca 1981
    I am just in the middle of going through everything in the clock cluster it’s the one with the stupid Atari unit what I need to know is behind the speedo there is what looks like an inch long tube light is it a light or some sort of resister
    If it is a bulb anyone know where I can locate one as I am not getting any continuity reading with meter connected to each end
    Any help appreciated
     
    Mark George, Oct 24, 2023
    #1
  2. Rooster53

    Rooster53 Well-Known Member Premium Member

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    The Atari is cool and adds some nice safety checks :)

    That is a reed switch that is used for the self cancelling unit and it is controlled by the same magnet that moves the speedo pointer. If you rotate the speedometer cable (or speedo magnet) it will close 4 times per full rotation of the cable. Each time it closes it grounds the W/G wire. The rate (frequency) is then converted to a DC signal within the cancelling unit and that determines when the flashers automatically stop
     
    Rooster53, Oct 24, 2023
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    cds1984 and chacal like this.

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