M33 Electronic Regulator

[MALL33]

Hello

I am fitting a Wassell WW10221N electronic regulator (negative earth) to replace the old regulator on my 1948 M33. I have managed connecting to the wiring harnes ok, But I am struggling to undertand the instructions for changing the wiring within the dynamo. Please can anyone advise? I can post Wassell wiring instruction and dynamo pics if needed.

Thank you

[AWJDThumper]

Please post the wiring information

[MALL33]

Hi, Thanks for your reply. Please see attached, its the Wassell wiring diagram that pzzles me.

[AWJDThumper]

At face value, your dynamo appears to be wired up as per the revised Wassell wiring diagram which I believe is how they are normally wired up. I assume your problem is that the first wiring diagram doesn't make sense?

[MALL33]

I tested the dynamo as a motor and it ran ok. When I run the bike I dont think its charging, as the battery became fully discharged. Thats why I thought the dynamo would need rewiring as the Wassell iinstrutions suggested.

I have rebuilt the bike but never saw it running before. I am sure the dynamo is original to the the bike along with the old regulator (which is wrecked)

Thanks for your time

[JulianS]

The photo shows the commutator looking very dirty  and the brushes worn.

Unless you have cleaned commutator and replaced brushes the dynamo will not give its best.

[AWJDThumper]

I would also check the field coil is not open circuit by measuring for finite resistance between the two wires emerging from the inside of the dynamo.

[STAR TWIN]

Is your dynamo polarity correct? Try flashing it.

[MALL33]

Thanks for your advice. I will start with new brushes, then do tests.