I have a brand new regulator that I remember buying, but cannot remember for which bike. Unfortunately, I have lost receipts and the packaging.

I think it could be a solid state 12 volt regulator/rectifier which I bought for my triumph, which is positive earth and has Lucas Rita electronic ignition.

Does anyone know how I can check what I have?

My concern is frying things that should only be simmered.

Regards

Pat

email (option): sacombsashtrees@hotmail.com

Hello Patrick,

The BSA has a dynamo, which requires a regulator and a cut-off.
The dynamo is a "DC (Direct Current) machine".
The Triumph has an alternator, which requires a rectifier with a regulator,
Or a zener-diode.
The alternator is an "AC (Alternating Current) machine"
The units are not interchangeable.

Does the part you have, has anything at all marked on it?

Cheers,
Noam.

Hi Noam

Unfortunately no markings.

It looks like a 12v regulator rectifier with two yellow wires for the alternator and one black and one red wire (red to battery and black to earth....I guess!).

I was having problems with charging, I think this is why I bought the thing in the first place.

I think I might risk it and put it on the triumph for a second or two.

My existing Zenor seems not to be reducing the voltage sufficiently, with 15V going to a very small battery. It hasn't boiled the battery yet. However, with the lights off at full speed I get 15v, but with the lights on only 12v.

I will give it a go.

Regards

Pat

email (option): sacombsashtrees@hotmail.com

Hi Pat.

It sounds like what you got is a regulator rectifier for a one phaze alternator.
It should work instead of the Zener.

Good luck,
Noam.