SMITHS REGULATORS For all BR series regulators Negative eg: BR1307-00NEG B= Battery (+12volts) I= Instrument (these have two terminals each available) The case is (-) earth Three Gauges may be regulated per regulator. For Positive Earth Regulators BR1307-00POS B= Batery (- 12 volts) I= Instrument (these have two terminals each available) The case is (+) earth Three Gauges may be regulated per regulator.
It is not possible to change polarity on the modern Solid State Smiths Regulators. It is possible to change the polarity on the original Smiths Regulators.