03-04-2021, 01:55 PM
Hi again JonE
Somehow I haven't made myself clear in my post above. I am pretty sure (cannot be 100% without seeing it) that you have a 3 brush dynamo wired with its main output and field joined, which will function more or less as designed at its full (winter/headlights) output. Voltage regulation (of sorts) is taken care of by the 3rd brush, no external regulator is needed, just a cutout.
The Ducellier regulator is a red herring. I suspect someone in the past couldn't get hold of an original 6 volt cutout, so they are using just the cutout part of this. The regulator part (which only suits a more modern 2 brush dynamo) isn't needed and isn't being used.
I'd be wary of swapping connections just to see what happens, especially given that the present setup appears to be working.
Somehow I haven't made myself clear in my post above. I am pretty sure (cannot be 100% without seeing it) that you have a 3 brush dynamo wired with its main output and field joined, which will function more or less as designed at its full (winter/headlights) output. Voltage regulation (of sorts) is taken care of by the 3rd brush, no external regulator is needed, just a cutout.
The Ducellier regulator is a red herring. I suspect someone in the past couldn't get hold of an original 6 volt cutout, so they are using just the cutout part of this. The regulator part (which only suits a more modern 2 brush dynamo) isn't needed and isn't being used.
I'd be wary of swapping connections just to see what happens, especially given that the present setup appears to be working.