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    #1

    Another charging issue...

    Hi all,
    I know I know, another charging issue, let me start by saying yes I have read everything there is on this forum and bikecliff there is about stators and R/Rs, I am also a technologist so know my way around electrical systems. So with out further hobbling about posting, I have an 81 GS650GL that I picked up a few weeks ago, was stone dead and sat dead for about a year or so and also bought a spare parts bike all boxed up for $200. The bike is now running but not charging great, looks like the previous owner changed out the R/R. I cleaned up the connectors and removed the headlight loop.

    first test:
    Stator check - average 1.3ohms per coil, OL on all coils to GND
    starting voltage 12.7V
    13.13V @ 1200rpm
    13.22V @ 4000rpm
    13.4V @ 5000rpm
    between stator windings 30Vac at idle to 75Vac at 5000rpm    ​

    found a brand new stator in the parts bike possible from ricks electronics according to images on fortnine
    Stator check - average 1.3ohms per coil, OL on all coils to GND
    starting voltage12.72V
    13.94Vdc @ 1200rpm
    13.78Vdc @ 2500rpm
    13.8Vdc @ 4000rpm
    13.9Vdc @ 5000rpm
    forgot to measure between windings

    swapped the     R/R from the parts bike, this was original factory so not hopeful, should mention also i trickle charged the battery between tests except for this one and took out for a short 30km rip day before
    Stator check - average 1.3ohms per coil, OL on all coils to GND
    starting voltage 12.42V
    13.94Vdc @ 1200rpm
    13.78Vdc @ 2500rpm
    13.5Vdc @ 4000rpm
    13.4Vdc @ 5000rpm
    between stator windings 25Vac at idle to 83+Vac at 5000rpm    ​

    the lower voltage tells me the R/R is either breaking down and higher RPM or working harder to make up the small voltage drop from the starting voltage. I've searched everywhere for a reputable SH775 but not turning up much, any ideas or alternatives to the sh775 folks have had luck with?
    My daily fun bike 03 Kawasaki ZR7S
    My project 81 GS650GL, maybe a racer, maybe a scrambler, who knows
    My future project 81 GS650G bike in a box
    Tags: None
    #2
    Ask Nessism if he has any SH775s. He sometimes buys good used ones, tests them on his bike and resells them. Maybe he’ll even ship to Canada. Don’t know.
    Rich
    1982 GS 750TZ
    2015 Triumph Tiger 1200
    BikeCliff's / Charging System Sorted / Posting Pics
    Destroy-Rebuild 750T/ Destroy-Rebuild part deux

    Comment

      #3
      Are you taking those voltage readings at the battery?

      If so, what do read at the R/R output?

      And does anyone know if the GS650 has that nasty old splice about a foot into the main harness where the output of the R/R ties into the main Harness?

      That splice on my GS750 was turning slightly green when I opened it up.
      Jim, in Central New York State.

      1980 GS750E (bought used June,1983)
      1968 CB350 Super Sport (bought new Oct,1968)
      1962 CA77 305 Dream (bought used Feb,1963)

      Comment

        #4
        OP wrote that he eliminated the headlamp loop.
        Rich
        1982 GS 750TZ
        2015 Triumph Tiger 1200
        BikeCliff's / Charging System Sorted / Posting Pics
        Destroy-Rebuild 750T/ Destroy-Rebuild part deux

        Comment

          #5
          I have a few SH775's, but shipping to Canada costs money, and is buzz kill.

          Error Page | eBay
          https://www.ebay.com/itm/384089812640


          This one will save some money. Hook it up like shown, and you will know that the problem isn't the R/R.

          SH775 Install by nessism, on Flickr
          Ed

          To measure is to know.

          Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

          Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

          Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

          KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

          Comment

            #6
            Originally posted by pdqford View Post
            Are you taking those voltage readings at the battery?

            If so, what do read at the R/R output?

            And does anyone know if the GS650 has that nasty old splice about a foot into the main harness where the output of the R/R ties into the main Harness?

            That splice on my GS750 was turning slightly green when I opened it up.
            I pulled that loop and isolated those wires, I have my meter fastened directly to the battery, am I wrong to think the R/R line feeds back directly there as well?

            My daily fun bike 03 Kawasaki ZR7S
            My project 81 GS650GL, maybe a racer, maybe a scrambler, who knows
            My future project 81 GS650G bike in a box

            Comment

              #7
              Originally posted by Nessism View Post
              I have a few SH775's, but shipping to Canada costs money, and is buzz kill.

              Error Page | eBay
              https://www.ebay.com/itm/384089812640


              This one will save some money. Hook it up like shown, and you will know that the problem isn't the R/R.

              ***edit, wait one just saw the 0.3v part in the drawing, for what it is I did cut out all the extra wiring and three extra plugs previous owner had in there (not sure what that was about) and the stator is directly connected to the R/R yellow wires using bullets I installed. I will check that red wire connection tomorrow, I replaced that bullet also but not sure about what is between that and the battery.

              thanks again

              SH775 Install by nessism, on Flickr
              thanks Ed I can look at ordering that, shame I’m in BC, that seller is not too far from my old man’s place. You mentioned …” you will know that the problem isn’t the R/R” know I’ve read a lot of your comments and this forum, do you think I’m going the wrong way?
              Last edited by LMARJ2434; 10-10-2023, 12:30 AM.
              My daily fun bike 03 Kawasaki ZR7S
              My project 81 GS650GL, maybe a racer, maybe a scrambler, who knows
              My future project 81 GS650G bike in a box

              Comment

                #8
                @Nessism​ I hooked up as per the drawing and measured an average of 0.15Vdc but it was pretty choppy so might be some badish wiring in there, thanks for that. I also measured from that R/R bullet to battery gnd as @pdqford​ indicated above once the bike was warmed up and did see voltages sitting around 14 at idle so that is pretty promising. Think the neighbors are getting tired of me reving the engine though so Im going to replace that section of wiring and report back over the next few days to the weekend. Thanks again
                My daily fun bike 03 Kawasaki ZR7S
                My project 81 GS650GL, maybe a racer, maybe a scrambler, who knows
                My future project 81 GS650G bike in a box

                Comment

                  #9
                  Originally posted by Rich82GS750TZ View Post
                  OP wrote that he eliminated the headlamp loop.
                  Understood. But what I’m referring to is where the output of the R/R goes into the main harness on its way to the battery. At least on my GS750ET, about a foot into the main harness, the R/R output wire has a manual splice into the main harness. On my bike that splice was turning green.

                  Before the OP starts unwrapping the main harness, I was hoping one of the experts would know if the GS650 has that same splice or not.
                  Perhaps doing a proper voltage drop test between the R/R output terminal and the battery positive post should should indicate how much voltage is being dropped on that leg of the circuit.
                  Jim, in Central New York State.

                  1980 GS750E (bought used June,1983)
                  1968 CB350 Super Sport (bought new Oct,1968)
                  1962 CA77 305 Dream (bought used Feb,1963)

                  Comment

                    #10
                    Originally posted by pdqford View Post

                    Understood. But what I’m referring to is where the output of the R/R goes into the main harness on its way to the battery. At least on my GS750ET, about a foot into the main harness, the R/R output wire has a manual splice into the main harness. On my bike that splice was turning green.

                    Before the OP starts unwrapping the main harness, I was hoping one of the experts would know if the GS650 has that same splice or not.
                    Perhaps doing a proper voltage drop test between the R/R output terminal and the battery positive post should should indicate how much voltage is being dropped on that leg of the circuit.
                    Jim, I was wrong in my original assumption that the output went directly to the battery. I measured this morning off the bullet to the battery and saw about 0.15V on average, it was a little choppy. I did revert back to the aftermarket R/R the previous owner put on and measured what was supplied to the battery using that output and saw between 13.8 - 14V at idle. I didn't do the full test, was being pretty loud and had to get to work.
                    My daily fun bike 03 Kawasaki ZR7S
                    My project 81 GS650GL, maybe a racer, maybe a scrambler, who knows
                    My future project 81 GS650G bike in a box

                    Comment

                      #11
                      I put a new clutch cable in today, fixed my choke cable and tightened up the rear suspension so decided to go for a rip and did not do the full voltage test. I did however measure my battery before starting and came back after 35km with a nicely fully charged battery so i guess cleaning up the wiring harness did do some good. Thanks again all, loving cruising around Southern Vancouver Isalnd with this bike, almost feel bad for the young fella that sold it to me!
                      My daily fun bike 03 Kawasaki ZR7S
                      My project 81 GS650GL, maybe a racer, maybe a scrambler, who knows
                      My future project 81 GS650G bike in a box

                      Comment

                        #12
                        You should look up trevor he’s in your neighborhood, has a garage full of nice bikes, at least 3 GSes of various vintages.
                        Rich
                        1982 GS 750TZ
                        2015 Triumph Tiger 1200
                        BikeCliff's / Charging System Sorted / Posting Pics
                        Destroy-Rebuild 750T/ Destroy-Rebuild part deux

                        Comment

                          #13
                          Originally posted by Rich82GS750TZ View Post
                          You should look up trevor he’s in your neighborhood, has a garage full of nice bikes, at least 3 GSes of various vintages.
                          Hey ya I just saw this....I'm in Victoria with 4 GS's
                          Cheers
                          No signature :(

                          Comment

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