Never ask a car mechanic to work on your airplane...
How many now does this make? Three dozen listed on this site?
My recommendation is that you yourself personally let a professional who knows what they are doing do the install for you.
You need to examine the socket. Obviously there is a 2nd LINE voltage connected to where a neutral should go. Not only does a line connection have to be there it has to be in the right place. So does NEUTRAL and so does earth ground. And all three circuits have to be connected to the right pin for it all to work.
Do you know what neutral is? How to find it in the circuit box? It has to by code be a white wire. Your breaker is most probably a ganged double breaker at the moment. You need to switch it to a single breaker. Have you any experience doing work like this?
Do you have the aptitude to disassemble your converter and check continuity through soldered on tube glass fuses?
"Someone told me's" have caused fires and fatalities.
It is highly likely your converter is irreparably damaged.