How to Rewire a Lamp | Rewiring a Lamp | This Old House Overview Diagram for Rewiring a Lamp. Always unplug a lamp before attempting any repairs. Remove the Base. Pry cover off the bottom of the lamp to reveal the nut holding the pipe through Thread the New Cord. Cut off old plug; attach new cord to old cord and pull all the way up through Make the Wire Connections. Split top 2 inches of cord jacket off new cord; strip ½-inch of insulation See all full list on thisoldhouse Index of Household Electrical Wiring Diagrams and Projects House Wiring Diagrams and Project Guides. Lamp Wiring Diagrams-Wiring for a standard table lamp, a 3-way socket, and an antique lamp with four bulbs and two switches. Adding a New Electric Wall Outlet-How to run cable behind a baseboard to add a new receptacle outlet.