There’s nothing wrong with 1 wire set ups. It does the same thing as the external voltage regulator, the voltage regulator is just internal. And power master alternators are decent too, I have a standard external voltage regulator version on my Challenger that was there for most of the 70k miles on that car. And I had a standard one on my Duster up until I installed a much improved American Autowire harness, which required a 1 wire alternator. So now it runs a 1-wire power master.