Dear BSA experts

After several years putting on hold my m21 restoration, I decided to put an effort and continue the project.

Last time I left my dynamo working as expected supllying 6v.

Now after several years in a storage, the dynamo is dead.

First I would like to check the feild coil and the armeture impedance.

Any one knows what are the measured parameters and how do I measure it?

I have a multy tester with an ohm meter option.

I hope to finish the project this time

Regards

Noam

Hi Noam...It's fairly unlikely it has developed a fault in storage...
I'd check the brushes are moving freely in the holders, give the commutator a light squirt with some WD 40 and spin it up to see if you have some output..or alternatively run a 'motor' test on it with a fully charged battery..
Once it has spun a bit clean the commutator off with some clean tissue paper or a clean rag....Ian

Hello Noam,

First of all. I would try what Ian suggested.

If the dynamo still fails to generate, you might want to go to the
tech section of this site, and look at the re-polarization instructions.

In order to generate voltage, the dynamo first uses the residual magnetism,
in order to generate enough voltage to feed the field coil and so on.
if the dynamo was not working for few years, it may lost this residual
magnetism, and cannot generate.

Are you Israeli? (I guess, by the name..)
Drop me a line and I will try to help.

If you are looking for info like resistance and so on,
check this out: (For E3L "long" 60W dynamo)

https://www.google.co.il/#q=lucas+e3l+dynamo+field+resistance

go for the first result (PDF)
I tried to paste the link here, but some characters turns into icon
and it did not work..

Cheers,
Noam.

email (option): noam10@gmail.com

Thanks for all the usefull advices I checked again and the dynamo is fine.

My measuring was wrong

Thanks