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Tach needle jumping around...

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  • #16
    The only time I ever saw mine go up to 15 plus is when my voltage regulator was bad. I honestly can't remember what my tach was doing though. I replaced the voltage regulator and everything went back to normal.
    2 - 80 LGs bought one new
    81 LH
    02 FXSTB Nighttrain
    22 FLTRK Road Glide Limited
    Jim

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    • #17
      Well Jonny, it looks like either obtain another tach and try it, or continue going through the wiring, cleaning all related connectors. At this point it could be either or maybe even something else. Operating on a tamper proof tach might not be for you. It's an extremely finicky task.
      Last edited by bikerphil; Today, 12:15 AM.
      2H7 (79) owned since '89
      3H3 owned since '06

      "If it ain't broke, modify it"

      ☮

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      • #18
        Originally posted by LAB3 View Post
        15 sounds a bit too high, are you running a lithium battery? I'd be leery of anything higher than about 14.4 with a lead-acid battery.

        The tach itself is reading off one of the stator windings which would be an AC voltage somewhere in the 50v+ range.
        Actually LAB3, A lead acid wet cell battery on a 12V system, the regulated voltage with system running and working correctly, regulated voltage correctly should show to be 13.8-14.2volts. That comes from having 50+yrs. experience diagnosing 12v d.c. elecrical systems in the automotive world. That may also be of help to many others here.
        81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

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        • #19
          LAB3, no offense intended by my previous post, just factual knowledge.
          81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

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          • #20
            Originally posted by motoman View Post
            LAB3, no offense intended by my previous post, just factual knowledge.
            None taken. After living over 20 years with an off grid power system running 12v lead acid batteries I have a good bit of charging system experience myself. Anything over 14.2 would be suspect in that scenario although I've seen people bump that set point up a bit to 14.4 with AGM.
            1980 XS1100G

            I identify as a man but according to the label on a package of Stauffers Baked Lasagne I'm actually a family of four!

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            • #21
              Originally posted by LAB3 View Post
              15 sounds a bit too high, are you running a lithium battery? I'd be leery of anything higher than about 14.4 with a lead-acid battery.

              The tach itself is reading off one of the stator windings which would be an AC voltage somewhere in the 50v+ range.
              I don't believe so. Just an Interstate. I don't think they list a lithium for an XS. I've had it for a couple of years.

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              • #22
                Maybe the trickle charger has eventually done something not good? Battery shows 13.18 after unplugging charger and revs up to 14.81 on choke.

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