Long live the "zombie" thread back from the dead.. Well I guess it is pretty close to Halloween and perhaps need to play "Thriller" by Micheal Jackson to set the mood..
Last post was back in 2015, OP GAVE UP on this project.
And Seon, your "device" cannot and will not and will never work for what the OP was trying to do which was to REWIRE A OLD SCHOOL NON INVERTER GEN! The gen in question is a Harbor Freight 4kw 240/120V gen.. OP was trying to parallel the 120V windings to make it a 120V only gen..
OP was not able to make it work, I suspect the issue was coming from how the AVR was getting it's feedback voltage from the windings and it did not like it..
The device you posted is designed to connect two INVERTER GENS together, a feat which isn't so simple with old school non inverter gens.