I need to go from a 4 prong plug to a 3 prong plug. What wire do I leave out?
Answer Hello Ron,
Where the 4 prong had the green going to chassis ground, the three prong hasn't got that. White goes to the center terminal and black goes to either side and red goes to either side. The black and red can be crossed with no effects. They are L1 and L2 and the appliance won't know if they are crossed. It will work normally either way as long as the white goes in the middle.
How do I go from 4 prong to a 3 prong?
Answer Hello Ron. Remove the 4 prong from the unit and then take the two outside wires and place on the two outside screws and place the center wire on the center screw on the terminal block.