charging question.

[Ray White]

The mystery is that the engine had to be revved quite hard to close the cutout.
One thing there is now less risk of it sticking closed when stopped.
There will be specs somewhere for cut in and out volts (latter not as in car) but few can organise the variable voltage source to test.

I think the brushes may have been sticking but now, with some use, they are operating freely and all is well.

(Having said that, I took the car out for a run and suffered a blocked jet..... You can't win sometimes!)