[rotorwrench]

John Regan sold his business to the Folks at Birdhaven Vintage Auto Supply some time ago. They also purchased Texas T parts so it's a wonder that they have been able to keep up with things in these trying times. They have been supplying restoration parts suppliers and may have had problems getting electrical components.

The voltage regulators have been available for different voltages and different polarities for some time but there are cautions for these units. They can be damaged if not connected correctly or if the battery is disconnected from the system while in operation so folks have to be careful with them. There used to be several others fabricating voltage regulators for the Model A cylinder shaped generators that were fit inside the generator and use a diode or cut-out for switch control. I don't know if any of these are still available or not.

Many model Ts have conversions to 12-volt negative ground systems so I know it has been done but it may take some persistance to get what you want.