Am dealing with the motor out of a 70's era european built sewing machine. It is 110V and I believe it was two-speed but not sure. It has four wires coming from it; red ( to frame of motor), blue, grey, and black. I am trying to figure out which wires to connect to one side of power and which wire/s to connect to one side of foot control. If it is two speed, would be interested in how to wire to a switch to select speed, otherwise simply interested in high speed connections.
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