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    Battery not charging (GS550E 1980)

    I swapped out an engine for a new reconditioned one
    and am almost at the end of running it in.
    On 300 miles so far.

    Battery bench charged and at 12.8-13v
    when tested. Bike starts easily.
    Test:
    bike on - drops a few 0.1 volts
    increasing revs to 4000 it makes no difference.
    So no increase in volts.

    Now I am sure this has just started to happen
    as a week ago I did this test and volts on
    battery increased with revs !! it's as if it
    is intermittent bit now dead.
    The battery also might not be perfect
    but takes charge on the bench so surely
    perfect enough for this test.

    - just changed to my spare regulator.
    a new one and no difference. (new one
    doesnt have a sense wire)

    Help . is it now the stater which is on the new engine ?
    Any tests for a regulator or stator a hapless
    electrical person can do ?
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

    #2
    Quick test. Linked in my signature
    Rich
    1982 GS 750TZ
    2015 Triumph Tiger 1200

    BikeCliff's / Charging System Sorted / Posting Pics
    Destroy-Rebuild 750T/ Destroy-Rebuild part deux

    Comment


      #3
      Thanks for quick test but you will note I have done
      that already and am way beyond that in analysis.

      The voltage does not increase with revs!
      tried another regulator- no change

      q) could a bad battery cause this? I.e
      a gradual decline and then when doing said test
      wont increase in volts and lights dont brighten?
      thing is when bench charged battery ok for
      20miles and then try to re start
      Last edited by ukjules; 03-31-2021, 04:29 PM.
      UKJULES
      ---------------------------------
      Owner of following bikes:
      1980 Suzuki GS550ET
      1977 Yamaha RD 250D
      1982 Kawasaki GPZ 750 R1
      1980 Suzuki GSX 250E

      Comment


        #4
        You could disconnect stator from RR, test stator leg to leg, in 3 separate pairs, with bike running at 5000K RPM, you should get somewhere between 70-90 vAC, IIRC. If ok then test each stator leg to ground. Don’t remember but think it should read 0 or very low voltage.
        Last edited by Rich82GS750TZ; 03-31-2021, 04:32 PM.
        Rich
        1982 GS 750TZ
        2015 Triumph Tiger 1200

        BikeCliff's / Charging System Sorted / Posting Pics
        Destroy-Rebuild 750T/ Destroy-Rebuild part deux

        Comment


          #5
          Ok will do this am tomorrow .

          I have in my notes 3 tests like what you suggest.
          I admit to being hopeless on electrics for various reasons
          and never get the damned mm setting right.

          test1:
          testing ohms on all 3 stator wires
          bike off
          a-b
          b-c
          c-a
          looking for consistency. what ohm setting on mm ?

          test 2:
          check to ground on battery each stator leg.
          should be open, what is open on mm ohm setting ?
          see I really dont get electrics !

          test 3: one you just said....
          disconnect stator from RR, test stator leg to leg,
          in 3 separate pairs, with bike running at 5
          000K RPM,
          you should get somewhere between 70-90 vAC

          my notes says tickover 15-20
          and when reved 50-70.

          mm setting AC / 200
          UKJULES
          ---------------------------------
          Owner of following bikes:
          1980 Suzuki GS550ET
          1977 Yamaha RD 250D
          1982 Kawasaki GPZ 750 R1
          1980 Suzuki GSX 250E

          Comment


            #6
            Here’s another link to a post by a previously active member who is sorely missed at times like this. Jim helped me a lot with my charging system.

            Rich
            1982 GS 750TZ
            2015 Triumph Tiger 1200

            BikeCliff's / Charging System Sorted / Posting Pics
            Destroy-Rebuild 750T/ Destroy-Rebuild part deux

            Comment


              #7
              Battery not charging:

              - revving bike - lights do not increase in brightness.

              - with bike running at increasing revs voltage remains the same at 12.* v on a charged battery.

              - Test resistance on all stator wires disconnected, ignition off. 200ohm setting on MM.
              a-b 6
              a-c 6
              b-c 6.3
              apparently ok as looking for consistency?

              - test each stator leg to ground on battery :
              a 5.7ohm
              b 5.7ohm
              c 5.7ohm

              - Test with engine running, stator wires disconnected from regulator ,
              MM set for 200 ACV

              test stator leg to leg,
              in 3 separate pairs

              2k revs
              a-b 20
              a-c 18
              b-c 24

              3k revs
              a-b 28
              a-c 25
              b-c 41

              4k
              a-b 28
              a-c 25
              b-c 41

              5k
              a-b 30
              a-c 30
              a-b 47

              my notes say idle should be 20v and when rev be 50-70v.
              at 5k others say 70-90v !

              So what's reckon?
              is it the stator that remember is on a engine I have only run for 3o0 miles.... and I still have my old one.

              one other thing battery in gsx - testing volts with increased revs does go up correctly .
              Last edited by ukjules; 04-01-2021, 03:48 PM.
              UKJULES
              ---------------------------------
              Owner of following bikes:
              1980 Suzuki GS550ET
              1977 Yamaha RD 250D
              1982 Kawasaki GPZ 750 R1
              1980 Suzuki GSX 250E

              Comment


                #8
                Assuming your meter is good .....your results say your stator is no good...seems to be shorting out to ground.
                1981 gs650L

                "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                Comment


                  #9
                  I reckon meter is ok. Tests ok on other bikes.
                  Assume it is.

                  Remember I am useless at electrics but
                  do you reckon next thing is to swap for my
                  old stater ? which always worked ?

                  or are there more tests / fixes
                  for what you say ?

                  cheers by the way all for advice.
                  UKJULES
                  ---------------------------------
                  Owner of following bikes:
                  1980 Suzuki GS550ET
                  1977 Yamaha RD 250D
                  1982 Kawasaki GPZ 750 R1
                  1980 Suzuki GSX 250E

                  Comment


                    #10
                    Test - visually look at it to see how cooked it is

                    Fix - replace with a good one and be sure you have upgraded to a Series R/R like the SH-775
                    sigpic
                    Cowboy Up or Quit. - Run Free Lou and Rest in Peace

                    1981 GS550T - My First
                    1981 GS550L - My Eldest Daughter's
                    2007 GSF1250SA Bandit - My touring bike

                    Sit tall in the saddle Hold your head up high
                    Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
                    and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

                    Comment


                      #11
                      Ok,

                      so the analysis you think means its cooked!
                      and a visual test along with the more detailed
                      test I have done would conform its bust ?

                      This being possible to see if I take it off .
                      and see some form of blackening?
                      Have we pics of a cooked stator ?

                      I will take off anyway and send pic of
                      mine and the one to put on.

                      Regulator:
                      I think my ones are ok.
                      One with a sense wire and one without
                      but have the standard bullet connections.

                      the sh 775, reg you say has connectors which
                      I most certainly dont have. I assume some
                      come with connectors.

                      q) what is so good about a sh 775 ?
                      compared to a stock one ?
                      Last edited by ukjules; 04-02-2021, 01:34 AM.
                      UKJULES
                      ---------------------------------
                      Owner of following bikes:
                      1980 Suzuki GS550ET
                      1977 Yamaha RD 250D
                      1982 Kawasaki GPZ 750 R1
                      1980 Suzuki GSX 250E

                      Comment


                        #12
                        There are over a hundred posts in the forum about how they work and why they are better. Seek and you shall find (using keywords like series or shunt regulator will help)

                        The connectors that go to the Stator can be bullets, spades or soldered. You can make your own connectors to fit the R/R side (can get a set from Eastern Beaver) or you can pick up the Polaris harness for a fairly reasonable price.
                        sigpic
                        Cowboy Up or Quit. - Run Free Lou and Rest in Peace

                        1981 GS550T - My First
                        1981 GS550L - My Eldest Daughter's
                        2007 GSF1250SA Bandit - My touring bike

                        Sit tall in the saddle Hold your head up high
                        Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
                        and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

                        Comment


                          #13
                          All indications are your stator is cooked.

                          Only one thing caused the demise of your stator.
                          Your R/R is not OK.

                          As Cowboy says, read some of multitude of posts on this subject - why would your situation be different?
                          -Mal

                          "The only reason for time is so that everything doesn't happen at once." - B. Banzai
                          ___________

                          78 GS750E

                          Comment


                            #14
                            Here's tbe SH-775 explanation..


                            looking at a stator ain't always convincing ....lots of eBay units are clearly cooked. But here's a pic of my previous stator that struggled to produce 13.5 volts. The pencil is pointing to a small fried area

                            image.jpg
                            1981 gs650L

                            "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                            Comment


                              #15
                              About to swap over stators.

                              Will post pics and analysis but as
                              my original never had this issue and this engine
                              looks like it always has had this issue
                              and my analysis kindly reported on by one ....
                              logically it has to be the stator.

                              P.s I write on this forum to help others
                              as issues are fixed. My posts on electrics will
                              help non electrical people.

                              p.s I see your point on making own bullet connectors.
                              yes I can do that and of course simply
                              cut off connector box and put on bullets ones
                              yes I could do that... if reg fails test later
                              Last edited by ukjules; 04-03-2021, 05:46 AM.
                              UKJULES
                              ---------------------------------
                              Owner of following bikes:
                              1980 Suzuki GS550ET
                              1977 Yamaha RD 250D
                              1982 Kawasaki GPZ 750 R1
                              1980 Suzuki GSX 250E

                              Comment

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