On an installation where the C pin is permanently connected to the B pin, once turned on, the B pin will power the C pin. The regulator can not be turned off, it will continue to output power until the engine stops rotating. Attempting to disrupt the regulator output by removing the 25 amp fuse can damage the regulator. Without a system load or battery to stabilize/limit the output, the B/C pin voltage will fluctuate with peak voltage similar to open circuit stator voltage. The higher voltage on the C pin exceeds the wattage rating of the resistors in the regulator’s internal control/sense circuit. Given enough time they will open.
Disconnecting the C pin will turn off the regulator, it’s not possible to damage the regulator by opening the C pin.
In my opinion it’s preferred to open the C pin to turn off the regulator as opposed to an electrical system that can’t be shutdown and may be damaged if an attempt is made to disable it.
