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  • #1

    random headlight fuse

    The headlight fuse now goes at random. Seems to love to wait until nightime so I can't get home without changing it but it's random. I have a new regulator installed and an extra Reserve Lighting Unit but I've tried both of them. I'll swap them again just to make sure. Any similar experiences would be of interest. Otherwise everything is in order, runs
    like the wind...... Thanx
    Tags: None
  • #2
    You have a intermittent short somewhere. The first place to look would be the handlebar switch.

    Do you have a fairing on it?

    We can help you better if you fill out your info at the bottom as to your bike, accessories, and any mods.
    Greg

    Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

    ― Albert Einstein

    80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

    The list changes.

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    • #3
      +1 on what Greg said. You have an intermittent short somewhere and you are going to have to go hunting to find it.
      Nathan
      KD9ARL

      μολὼν λαβέ

      1978 XS1100E
      K&N Filter
      #45 pilot Jet, #137.5 Main Jet
      OEM Exhaust
      ATK Fork Brace
      LED Dash lights
      Ammeter, Oil Pressure, Oil Temp, and Volt Meters
      Green Monster Coils
      SS Brake Lines
      Vision 550 Auto Tensioner

      In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

      Theodore Roosevelt

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      • #4
        handlebars looked good

        Thank you BA80 yesterday I took the handle bar switches apart and everything looked fine but haven't rode again to test. Have been all over that bike this summer. It has had the headlight problem for quite some time. I had a problem with the main fuse holder for awhile but fixed that. hmm ..... have a feeling this one will take awhile....will post occasional updates

        fusebox replaced with
        4 single fuse holders

        starter button ala Radioshak

        new regulator

        Red 1978 standard

        Moto Guzzi handlebars

        no fairings or windshield

        Jardine 4 to 1

        drilled airbox
        Last edited by RED1978; 08-23-2012, 05:56 AM.

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        • #5
          not so random

          Turns out the blown fuse isn't really random.
          It happens during a restart, like for example when doing a u-turn
          or slow movement and you stall the engine. Then on restart the
          fuse blows. Went through three of them the other day and they all happened that way.

          Comment

          • #6
            Hey Red,

            You just stumbled on the next area to look, the headlight bucket and the holes where the wires run thru to the harness and frame around the neck.

            Turning the bars is moving wires around, and one has rubbed bare somewhere and is touching the bucket or frame and shorting to ground, blowing fuse.

            T.C.
            T. C. Gresham
            81SH "Godzilla" . . .1179cc super-rat.
            79SF "The Teacher" . . .basket case!
            History shows again and again,
            How nature points out the folly of men!

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            • #7
              Then only other 2 things in the headight circuit I can see causing a problem are the RLU and the diode in the wiring harness.

              I suspect the diode.
              Greg

              Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

              ― Albert Einstein

              80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

              The list changes.

              Comment

              • #8
                Originally posted by TopCatGr58 View Post
                Hey Red,

                You just stumbled on the next area to look, the headlight bucket and the holes where the wires run thru to the harness and frame around the neck.

                Turning the bars is moving wires around, and one has rubber bare somewhere and is touching the bucket or frame and shorting to ground, blowing fuse.

                T.C.
                I think that was it and I found it.......I think....thanks to all.
                Some old wire was sticking out. Looks like it was the turning after all.

                Comment

                • #9
                  Headlite fuse

                  +1 on what Greg said. You have an intermittent short somewhere and you are going to have to go hunting to find it.
                  __________________
                  Nathan

                  Do not use a 12 ga shotgun on it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  put something smooooth betwen your legs, XS eleven
                  79 F (Blueballs)
                  79 SF (Redbutt)
                  81 LH (organ donor)
                  79 XS 650S (gone to MC heaven)
                  76 CB 750 (gone to MC heaven)
                  rover has spoken

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