Generator rebuild
Generator rebuild
My 12v generator gave up this week
I've done some diagnosis and 0V when checking for max voltage, also tried repolarising but gen didn't spin. Therefore it needs a rebuild?
I need advice on who can rebuild, sells reconditioned generators or upgrade to an alternator.
Thanks, Jon
I've done some diagnosis and 0V when checking for max voltage, also tried repolarising but gen didn't spin. Therefore it needs a rebuild?
I need advice on who can rebuild, sells reconditioned generators or upgrade to an alternator.
Thanks, Jon
Re: Generator rebuild
Have you checked the basics? Are the brushes ok, they need to be sticking out higher than the holder. If they're flush or lower they're worn out. Are the brush springs good? Or have they broken/relaxed? Is the com clean? Is the dynamo receiving the field signal to trigger it?
The sultan of swing
Re: Generator rebuild
If you are confident there are other circuit checks to do. You'll need a multi meter and some dismantling skills. Otherwise, I've had these guys do some rewinds for me and there work is faultless. They aren't cheap, but my theory is, if it works it works. And they're are no fuss guys, if you have a problem with something they've done, they'll put it right.
http://www.robsonandfrancisrewinds.co.u ... index.html
http://www.robsonandfrancisrewinds.co.u ... index.html
The sultan of swing
Re: Generator rebuild
Your first thought was right, brushes completely worn out. Simple job to replace thembroady_6 wrote: ↑1st December 2017 - 11:27pmHave you checked the basics? Are the brushes ok, they need to be sticking out higher than the holder. If they're flush or lower they're worn out. Are the brush springs good? Or have they broken/relaxed? Is the com clean? Is the dynamo receiving the field signal to trigger it?
Re: Generator rebuild
Glad to hear your up and running again. Get some photos posted! would like to see your car
The sultan of swing
Re: Generator rebuild
Had to replace the brushes again after approx. 1000 miles. Is it likely to be poor quality parts or could it be something else?
Re: Generator rebuild
How did the commutator surface look? Did you use some fine sandpaper to clean it up? When turning did there seem to be excessive sparking? I've a feeling I've seen some warnings with replacement generators that suggest the guarantee is not valid unless the regulator is also changed. I've no idea of the substance of that though. Try a complaint with the place you bought them from?
There is a way round for them that I only found out about through the USA mail-list. They have a notch on the top which you would think the springs sits in. I'm told it shouldn't! It should be the other way round. I think the reason is that Beetle dynamos rotate the other way, and there's something about the way the brush sits on th commutator as it goes round (a bit like leading and trailing brake shoes, maybe). It's worth a look anyway. Jim Adney jadney@type3.org has a charging pdf he may be able to forward to you.
There is a way round for them that I only found out about through the USA mail-list. They have a notch on the top which you would think the springs sits in. I'm told it shouldn't! It should be the other way round. I think the reason is that Beetle dynamos rotate the other way, and there's something about the way the brush sits on th commutator as it goes round (a bit like leading and trailing brake shoes, maybe). It's worth a look anyway. Jim Adney jadney@type3.org has a charging pdf he may be able to forward to you.
Dave.
Re: Generator rebuild
Could also be the bushes/bearings are shot allowing the core to move around causing brush wear.
The sultan of swing