Had almost this exact same problem. I went from a U.S. 240V (NEMA L6-20) to a Euro 5 core plug. It was an exciting adventure.

Thank you , this has been scrambling my brain And I am no means a electrician at all

Just been pulling my hair out over the Neutral blue. Turns out it wasn't connected inside the motor, blanked off.

Wha is the size of cable