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  • #1

    charging problems

    This site rocks.Charging 13 volt at 3 to 4000 rpm not keeping battery charged.New battery that as been charged at 2 amps over night checked connections. One thing puzzles me stator rotor has little to no magnetizim , will not hold a piece metal . Is this correct or does need to be running? 1978 xs1100 43000 miles Thanks guys
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  • #2
    Behind the fuse panel there is a plug with green and brown wires that come from the field coil inside the right side engine cover. Check the resistance between these two wires they should be 3.5 ohms .
    BDF Special
    80SG Vetter bagger 1196 Wiseco big bore kit, Mega Cycle Cams, slotted cam gears, ported and flowed head, bronze intake seats, Dyno Jet kit, Dyno coils and Mikes XS air pods, Venture cam chain adjuster,Geezer's regulator, Clutch mod, Mac 4 into 1 with custom built and tuned baffle, Oil cooler,MikesXS emulators mod.
    Dyno tuned to 98 hp at the rear wheel.

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    • #3
      There is no magnetism until the bike is running. That's the purpose of the field coil (the part mounted on the center of the cover). Once the rotor starts spinning, and electricity is added to the field coil from the battery, that's when the magnetism starts, and allows the stator to create electricity.
      1980 XS850SG - Sold
      1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
      Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
      Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

      Whether you think you can, or you think you cannot - You're right.
      -H. Ford

      Comment

      • #4
        Originally posted by CatatonicBug View Post
        There is no magnetism until the bike is running.
        I have to disagree with that. Go get a thin feeler guage, turn on the key, and the feeler guage will stick to the alternator cover, bike not running.

        Nemesis, you might have some dirty connections on the alternator connector, also in back of the fuse panel.
        Last edited by bikerphil; 05-08-2010, 07:30 PM.
        2H7 (79) owned since '89
        3H3 owned since '06

        "If it ain't broke, modify it"

        ☮

        Comment

        • #5
          Originally posted by bikerphil View Post
          I have to disagree with that. Go get a thin feeler guage, turn on the key, and the feeler guage will stick to the alternator cover, bike not running.
          That magnetism is only left-overs. The steel in the alternator parts have been magnetized over time by being close to the electromagnet. Once the alternator is working, you can stick a razor blade or a paperclip to the side of the cover without a problem.
          1980 XS850SG - Sold
          1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
          Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
          Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

          Whether you think you can, or you think you cannot - You're right.
          -H. Ford

          Comment

          • #6
            The feeler guage will not stick when the key is off. Go and try it.

            Ok, there might be a little magnitism left over, but definitly not as strong as with the key on. The 3 bolts remain magnetized.
            Last edited by bikerphil; 05-08-2010, 07:46 PM.
            2H7 (79) owned since '89
            3H3 owned since '06

            "If it ain't broke, modify it"

            ☮

            Comment

            • #7
              Originally posted by bikerphil View Post
              The feeler guage will not stick when the key is off. Go and try it.
              Sorry.. I did not think of the difference between "key on" and "bike running". To me, that's the same. You are right. Once the key is on, the electromagnet is engaged, and it will hold metal. Mine actually does have a tiny amount of magnetism when the key is off though.

              The point is that the "rotor" never has magnetism by itself. It becomes part of an electromagnet generator once it starts spinning. The field coil is what is magnetic once the key is turned on.
              Last edited by CatatonicBug; 05-08-2010, 07:48 PM.
              1980 XS850SG - Sold
              1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
              Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
              Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

              Whether you think you can, or you think you cannot - You're right.
              -H. Ford

              Comment

              • #8
                great bunch of guys

                Thanks guys

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