charging system

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lwellis
Posts: 3
Joined: Mon May 08, 2017 12:43 pm

charging system

Postby lwellis » Thu Aug 17, 2017 3:46 pm

I have replace the rotor, stator and rectifier, still not charging battery. Continuity on stator and rotor is good. Cannot get any AC voltage out of stator at 5000 RPM. I have tried 2 new stators and 2 new rotors, still nothing. I replace the brushes when I first replaced the stator. Don't know where to turn.

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GeorgeSweety
Posts: 41
Joined: Tue Aug 08, 2017 11:47 am
Location: UK.

Re: charging system

Postby GeorgeSweety » Fri Aug 18, 2017 10:32 am

Hi Iwellis, I can't help you myself as I'm not very good with electrickery but have a read of this, if it doesn't help then try the forum search box at the top right.
viewtopic.php?f=4&t=13337&hilit=stator+not+charging&start=15

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GeorgeSweety
Posts: 41
Joined: Tue Aug 08, 2017 11:47 am
Location: UK.

Re: charging system

Postby GeorgeSweety » Fri Aug 18, 2017 10:34 am

Ooops! link is for page 2, you may want to read from page 1 :oops:

MEHall
Posts: 371
Joined: Mon Nov 15, 2010 8:25 am
Location: Sweden

Re: charging system

Postby MEHall » Fri Aug 18, 2017 2:19 pm

Well my CB 650 would not charge and i changed both rotor and regulator and still it would'nt charge, at the end i was forced to replace the electrical harness and after that no more charging problem. :wink:

So by the means check up if you got a faulty electrical harness. :wink:






8)
Riding bikes? I ride where ever i want and whenever i want. :wink:

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tario
Posts: 165
Joined: Sat Mar 07, 2015 2:26 pm

Re: charging system

Postby tario » Sun Aug 20, 2017 12:10 pm

You could just run some new wires to replace the yellow ones. I didn't notice the year in your post but generally the stator puts out 3 AC signals on 3 yellow wires. IIRC you need silicone jacket wires and stake-ons/crimp on connectors to make the connections to the current devices(soldering isn't a bad option either, and using shrink tube and/or splicing tape). There is wire rated to be out in the sun. I'm not sure if bikes have sun rated wiring but I'd try to put that in. If there is a cheap harness locally and you are diligent with the swap it should be a bit easier though.
1979 cb650
1980 cb650

lwellis
Posts: 3
Joined: Mon May 08, 2017 12:43 pm

Re: charging system

Postby lwellis » Sun Sep 17, 2017 8:35 pm

I really appreciate all the help, because I am about lost with this issue. Like I said before, I have used 2 different (new) stators, 2 different (new) rotors, 2 different (new) rectifiers, 2 different (new) batteries and replaced the brushes. I have checked the continuity on the rotor and stator, all good. From what I have read, I should be getting 50 or so AC volts through the 3 yellow leads coming from the stator at 5000 RPMs. I'm not getting shit. It's just a rotor spinning inside the stator, connected by the brushes. They are all new yet I am not getting anything out of the stator. Could this be a ground issue? I have also read a lot about the main wiring harness issues. I am prepared to change the wiring harness, but I would like to be reasonably certain this would correct the issue. Even though when testing the stator, straight off of the stator wiring harness, and getting basically no AC voltage, could it still be the main wiring harness? I mean, testing that way doesn't use the main wiring harness at all. That's why I am wondering if it could be a ground issue being caused by the main wiring harness.

lwellis
Posts: 3
Joined: Mon May 08, 2017 12:43 pm

Re: charging system

Postby lwellis » Mon Sep 18, 2017 1:57 pm

I did some further testing. It is my understanding about how this charging system works, that 12V DC is sent to the rotor to generate the AC voltage coming out of the stator. From what I can tell, there is almost 12V DC coming out of the rectifier (checking voltage on the black and white wires where the rectifier connects to the stator). If I am not correct in my thinking about how this charging system works, please set me straight. Does it make any difference which wire is connected to which brush? Just don't really know where to go from here. My thinking is, if I am getting the DC current out of the rectifier to go to the brushes then the problem is not in the main wiring harness.

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Folsoml
Posts: 1338
Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: charging system

Postby Folsoml » Tue Sep 19, 2017 5:32 am

Here is a link to a trouble shooting guide for the charging system. It was written for the DOHC Honda models of the same era, but the system on your bike is basically the same.

http://www.cb750c.com/publicdocs/chargi ... ystem.html

I hope the helps you.
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