irregular voltage regulator

[3W Hank]

I has the same issue now on one of my Ferguson tractors from the 40’s with Continental engines and positive ground 6V system.
This is Lucas UK parts and 2 coils inside.
It charge out ca 20 volts and it actually burned the insulation in the generator.
I use a mulimeter to test this.
The red light do light when ignition is on and do not go off when motor is running.
Thats wrong.
I tested 3 others regulators but was told this units easy gets bad if a tractor has been out or not been used for years.
I know generator is working again as I made a new isulator in cap and it charge to much volt.

My other Ferguson 48 tractor do work and red ligh go off in running engine snd it chages out 7.2 volt.
I use a 70 AMP std battery ( not Optima ) in this tractors.

As all parts is old and numbered parts on month/years I would like if possible to use the std regulator.
But I try to check points, and I try to adjust the shatter coil but no luck.

I will try get it tested but few shops or people know this stuff.
As a mechanical part, is there shops that do restore them ?
If, ideas to find them, I can send US or UK etc.

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In my 32 coupe I will use a 40’s style generator and I found a old Ford/Mercury regulator.
Both starter, generator is restored and I plan use a Optima battery here instead.