Question about 1977 Suzuki GS 750

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Battery doesn't charge

My 77 gs750 runs like a top,but does not charge the battery I can run it for 400+ miles until the battery is dead then so to the bike. Is it stator, rectifier or adapter? How to determine which it is?

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: burgman 250 will not start

Ck fuses and wire connections first. If no problem seen, get bike running and disconnect the ground cable @ battery. If bike dies the problem generally is in the stator or regulator assembly not keeping battery charged. Bike will run untill the battery is too low to keep the ignition system energized and the bike will die. If it continues running w/the ground disconnected, the battery could have a dead cell which will drain the battery in a very short time whether it is running or not.

Posted on May 03, 2009

  • 66 Answers

SOURCE: my battery is not charging when bike is running (gsxr 600 k6 )

When you put a voltmeter across the battery terminals, you should get >13.5V (typically) with the engine running. 
If less than this then your charging system is faulty and your battery will not charge. 
See this personally authored thread for a diagnostic guide on how to determine whether you have a problem with your stator or Rectifier/Regulator - inlcuding some cold resistance checks you can do on the R/R to determine if it is shorted. 
[url]http://www.triumphrat.net/speed-triple-forum/104504-charging-system-diagnostics-rectifier-regulator-upgrade.html[/url]
It was written initially for Triumphs, but applies to ANY 3-phase motorcycle charging system. 

Posted on Aug 15, 2009

  • 16 Answers

SOURCE: Faulty regulator rectifier- can't start the bike

I have a '07 C90T.
I have just replaced my stator. I replaced the reg/rectifier earlier this year. I replaced the battery one year ago in October.

I firmly believe what started the problem. Two guys that I told I didn't need help, but they pressured me to let them help. They hooked a battery backwards to my bike. A lot of people believe that's what shortened the life of the rectifier and stator.

But keep this in mind. The connections for the regulator/rectifier are not waterproof. I had done a lot of rainy riding and I first found a burnt connector on the discharge side of the reg/rect. My mechanic told me I needed to replace the reg/rect so I did but I soldered the wires and made them waterproof. I didn't do this on the stator side of the reg/rect and a few months later, when the bike quit charging again, I found that connector burnt, so I cut it out and soldered and waterproofed it.

Two days after we got back from a 700 mile round trip to Red River, NM, my bike quit charging again. This time though, I have a voltage meter on the bike, so I was aware of the problem before the bike could strand me someplace. Get one of those btw.
When I checked the old stator after I replaced it, I found the stator good but the pulse signal generator bad. It's required that you replace both btw. You have to, they are joined at the grommet.

Ok well, the battery cost $60 last year and I replaced it myself.
The reg/rect cost $140 through my mechanic and I replaced it myself.
Got the stator online for $173 shipped and they advertise a better stator that puts out 20% more power.
Not counting little things like solder, tape, heatshrink and such, I'm out a little less than $375 on my charging system.
I hope it's a done deal.
Again, some think the problems began when the battery was hooked up wrong, but I lean to believe the sub-standard Suzuki connections may have a hand in this.
Hope this helps. . . Joe

Posted on Sep 28, 2009

  • 16 Answers

SOURCE: The charging system is not working properly. With

What I learned on my '07 C90T----- is if it doesn't charge, it doesn't run for long.
I bet it's the battery.

I've had charging problems and I do blame a portion of it on Suzuki's connectors at the regulator/rectifier not being weatherproof.

I had to replace my battery at less than 10000 miles.
I had to replace the regulator/rectifier last April.
I had to replace the stator just two weeks ago.
When troubleshooting, I disconnected the stator at the reg/rect and only got 40 volts at high rpm.
It's supposed to put out 80 volts.
Got the stator from regulatorrectifier.com for half what the Suzuki shop wanted. Paid $173 shipped.

Posted on Oct 03, 2009

  • 2418 Answers

SOURCE: 1981 suzuki gs750. Replaced stator, wasn't

Have you checked the points? Be sure to clean the point contacts, also she may need a new condenser if it is not new (they break down with age). Did you clean the carbs? Did you mess with any adjustment screws? post back with what things you have done.

Posted on Apr 19, 2011

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