Holdwell Universal Automatic Voltage Regulator AVR SS053 for Generator Genset Parts 4 Wire Method Jumper from A to B connected SS053 is factory set for 240V 60Hz with a short from (B to A) and the dip switches set at (1 OFF) - (2 ON) - (3 ON) In this configuration It works like most AVRs in any 12 wire generators sets from 190 to 277 volts with the exciter field from 13 to 100 Ohms In this configuration the power and sensing are connected together into terminals C & BA, and the output terminals are connected to F+ and F-. Like this it can work in a multitude of configuration