To change from a three to a four wire cord you will need to remove the ground wire/strap that is currently connected to the center connection at the back of the dryer. This ground wire is going to look like a flat piece of either copper or aluminum that connects to the center peg and is screwed to the dyer cabinet right next to the cord terminal block SAVE THE SCREW. Doing this separates the electrical neutral and the cabinet ground.
Now when connecting the four wire cord, put the red and black wires on the outer connection posts (does not matter which goes on which side) and the white neutral wire connects to the center connector. The green or sometimes green with yellow stripe wire from the cord will connect to the cabinet where the ground strap you removed used to connect use the same screw that you removed earlier.
Good luck!
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