Electrical Plugs & Connectors at Lowes Shop electrical plugs & connectors in the cable & wire connectors section of Lowes. Find quality electrical plugs & connectors online or in store. How to Replace an Extension Cord Plug | This Old House Wrap the wire clockwise around the terminal and tighten each screw securely. 3. Reassemble the replacement plug and tighten the screws holding it to the cord. 4. To see if a cord is working properly, plug it into a three-prong receptacle. Then, fit a plug-in circuit tester onto the cord's other end.