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How to wire a 3 prong dryer cord

First remove the cover that protects the dryer terminal block. The dryer terminal block will have 3 lugs with nuts, Phillips or slotted screws. Connect the left and right wires from the cord to the left and right posts of the terminal block. The left and right wires from the cord can go on either side of the terminal block they are interchangeable. However it is very important that you connect the center wire from the cord to the center post of the terminal block.

How to connect a 4 wire dryer cord.

There are 3 lugs on the dryer terminal block. Connect the red and black wires from the cord to the left and right posts of the terminal block. The red and black wires from the cord can go on either side of the terminal block they are interchangeable. Then connect the white (neutral) to the center post. The green wire should be attached to the dryer chassis. The picture below shows the green wire hooked to the center (neutral) and this is WRONG! The green wire should be connected to the screw where the green wire on the chassis is connected.