I just "inherited" a Necchi supernova julia sowing machine. It has a 4 prong power plug (including foot pedal) which was already altered in the past and in sorry state. We tried to replace it and now the light only burns when you push the pedal. The motor hums but the machine does not start unless you help it by spinning the wheel manually. I oiled everything and things improved but I fear we did something wrong with the wiring to the plug. My husband is electrician and even he cannot figure out how to connect. Anyone have a tip?

Sewing Machines - Necchi