My father-in-law has a machine in his shop that runs off an electric motor . There is a plate on the motor that has diagrams that shows how to wire the motor for 120 v or 240 v . The motor has 4 wires coming out that are numbered 1-2-3-4 . For the 240 v connection it shows 2&3 together & 1 & 4 connecting to L 1 & L2 . That's the way it was wired when he got it , however he hooked it up to 120 v & it ran . For the 120 v connection it shows 1&2 connected to L 1 & 3&4 connected to L 2 . Since he wanted to run it on 120 I switched the motor wiring to match the 120 v diagram . It wouldn't run so I switched it back . It was getting late in the evening so I didn't check amperage , rpm , ect . I haven't been back to do any further checking so you now know as much as I do . Ideas , opinions ????