Jumpy tach

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  • mastan
    XStremely XSive
    • Jul 2002
    • 349
    #1

    Jumpy tach

    Hey all:
    I recall seeing a post a while ago about a jumpy tach being a symptom of some kind of electrical problem. My 78e just started giving a jump whenever I shift gears. I did a search but came up empty. At idle, or at constant RPM, it gives a steady read. Any ideas?
    TIA,
    Mark Stanton
    Tags: None
    • prometheus578
      XS-XJ Super Guru (RESIGNED)
      • Aug 2004
      • 4012
      • Olympia , Wa.
      #2
      The tach is operated offa one of the leads from the charging coil.
      Had a tach that would sometimes play dead, hold steady or just jump around.
      I swapped in a spare voltage regulator/rectifier and cleaned all the fuse conections. Which one of these actions cured the problem, I don't know.
      "Damn it Jim, I'm a doctor, not a mechanic!' ('Bones' McCoy)

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        • pggg
          XS-XJ Guru
          • Nov 2004
          • 1609
          • NZ
          #3
          Mas, the ancient plastic plug/pin connections between generator and tach can get dodgy. I've gradually ditched a lot of those plugs on my bike and replaced with single screw connecters. Not as conveniant to connect/disconnect as plugs, but at least you know your wiring connections are solid.

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