Alternator voltage regulator teardown and analysis
I have to ask the question, is it really worth all your time and effort for an unknown, aftermarket, cheap china etc etc look alike replacement, that you already know does not conform to OEM.
I would much rather have an in depth write up on the OEM circuit, maybe even a heavier transistor so that field current could be dealt with.
I am not a designer. Once in awhile I manage to repair something, but generally speaking, I do not do well on undocumented equipment or components