Trust Wiring
You can get wires and foot controller from Sew-CLassic.com. For a small fee, they will put it together for you. Just plug in and sew. Call Jennie for a price. I got the solid state foot controller and it was the best money I ever spent. It doesn't get hot like the old, resistor type. Sometimes you can feel "voltage leak" on some old machines. It is a kind of vibration that may feel like it is moving. It is because the old machines don't have 3-wire ground wires. Getting the new foot controller stopped that in my machine.
Over the years the controllers get dirty and no maintenance. The design is prone to all kind of problems.
Why didn't I have sense to replace it long ago????. It is way lighter to carry around too. Of course I saved the old one to inflict on any future "purist" who may want it. I'd never go back.