You can replace a damaged plug yourself in about 15 minutes with basic tools
A broken or cracked plug on an extension cord does not mean you have to throw the cord away. You can buy a replacement plug at any hardware store for $3 to $8, unscrew the old one, and attach the new one by connecting three wires. The job requires only a screwdriver and wire strippers—tools most households already have. As long as the cord itself is not damaged, a new plug restores the cord to full working condition.
This repair is safe to do yourself because extension cords carry standard household voltage and the power is off while you work. The hardest part is usually identifying which wire goes where, but the color coding is consistent across all cords: black is hot, white is neutral, and green or bare copper is ground.
Key Takeaways
- Turn off and unplug the extension cord before you begin, then use a screwdriver to open the old plug and note which wire connects to which terminal.
- Strip about half an inch of insulation from each of the three wires using wire strippers, then twist the exposed copper strands tight.
- Insert each wire into its matching terminal on the new plug—black to brass, white to silver, green or bare to green—and tighten the terminal screws firmly.
- Test the repaired cord on a lamp or other device before using it on anything expensive or important.
What you need before you start
Buy a replacement plug that matches the type of cord you have. Extension cords come in two-prong (older cords, no ground wire) and three-prong (modern cords with a ground wire). The replacement plug must have the same number of prongs. You can find these at any hardware store, home center, or online—they are usually sold in the electrical section near outlet adapters and power strips.
Gather a flathead or Phillips screwdriver (whichever fits the terminal screws on your new plug), a wire stripper tool, and a flashlight or work lamp if the area where you are working is dim. A small pair of pliers is helpful but not required. Lay everything on a clean, flat surface before you start.
How to remove the old plug
Unplug the extension cord from the wall outlet and set it on your work surface. Look at the old plug—you will see a seam running around the middle or a small slot. Use your screwdriver to gently pry the two halves of the plug apart. Do not force it; if it does not budge, try the other side of the seam or look for a small screw holding the halves together and remove that first.
Once the plug is open, you will see three (or two) wires connected to metal terminals inside. The terminals are small brass or silver screws. Before you disconnect anything, take a photo with your phone or write down which color wire is connected to which terminal. This takes 10 seconds and prevents mistakes. Then use your screwdriver to loosen each terminal screw and pull the wires free.
Preparing the wires for the new plug
Look at the end of each wire. You will see colored plastic insulation covering the copper. Use your wire stripper to remove about half an inch of insulation from the end of each wire. Set the stripper to the wire gauge marked on your cord (usually 12 or 14 AWG), insert the wire, and squeeze gently while pulling the wire through. The insulation will slide off, leaving bare copper exposed.
Once you have stripped all three wires, twist the exposed copper strands between your fingers so they form a tight bundle instead of a loose fringe. This prevents stray strands from touching the wrong terminal or creating a short circuit. If any insulation is torn or damaged further up the cord, wrap that section with electrical tape before you continue.
Connecting the wires to the new plug
Open the new plug the same way you opened the old one. Inside, you will see three terminals labeled or color-coded: brass (hot), silver (neutral), and green (ground). The black wire always goes to brass, the white wire always goes to silver, and the green or bare copper wire always goes to green. This is the standard for all plugs and cords in North America.
Insert the stripped end of the black wire into the brass terminal and tighten the screw clockwise with your screwdriver. Tighten it firmly but do not over-tighten—you want the wire held securely without crushing the copper. Repeat with the white wire in the silver terminal and the green wire in the green terminal. Tug gently on each wire to confirm it does not pull free.
Closing the plug and testing the repair
Check inside the plug one more time to make sure no bare copper is visible outside the terminals and no wires are touching each other. Then carefully push the two halves of the plug back together until they snap or seat flush. If there is a screw hole, replace the screw.
Plug the cord into a wall outlet and connect a lamp or phone charger to the other end. The device should power on normally. If nothing happens, unplug when ready, open the plug again, and check that each wire is in the correct terminal and tightened securely. Once the cord works, you can use it as you normally would. The repair is permanent and will last as long as the cord itself.
Common mistakes that cause problems
The most frequent error is mixing up the wires. Black always goes to brass, white to silver, and green to green—no exceptions. If you reverse black and white, the cord will not work. If you connect ground to the wrong terminal, the cord may work but the safety ground is defeated.
The second mistake is not stripping enough insulation. If you strip less than half an inch, the bare copper may not reach far enough into the terminal to make solid contact. If you strip too much—more than an inch—bare wire may be exposed outside the terminal and create a shock hazard. Aim for half an inch every time.
A third problem is leaving the terminal screw loose. A loose connection creates heat and can melt the insulation or start a fire over time. After you tighten each screw, pull on the wire with moderate force to confirm it does not move. If it does, tighten the screw another quarter turn.
When to replace the whole cord instead
If the cord itself is damaged—cracked, melted, or cut—do not repair it. A damaged cord is a fire and shock hazard that a new plug cannot fix. Throw it away and buy a new extension cord. The same applies if you see burn marks, discoloration, or a smell of burnt plastic anywhere on the cord. These signs mean the insulation has failed and the cord is unsafe.
If the cord is very old and the insulation is brittle or flaking, replacing just the plug is a temporary fix. Consider buying a new cord instead, especially if it will be used outdoors or in damp conditions. Modern cords have better insulation and safety features than older ones.
Frequently Asked Questions
Do I need a special plug for outdoor extension cords?
Outdoor cords use the same three-prong plugs as indoor cords, but the cord itself is thicker and made of weather-resistant material. When you buy a replacement plug, make sure you are buying one rated for outdoor use if that is where the cord will live. The plug packaging will say "outdoor" or "wet location" if it is rated for that.
What if my extension cord only has two wires, not three?
Older cords sometimes have only black and white wires with no ground wire. Buy a two-prong replacement plug instead of a three-prong. Connect black to brass and white to silver, then close the plug. Two-prong cords are less safe than three-prong cords, so avoid using them with tools or appliances that have metal cases.
Can I use a different gauge wire if I run out?
No. The wire gauge must match the cord you have. If you accidentally cut or damage the wire while stripping it, you will need to buy a new cord because splicing wires inside a plug is not safe. Always strip carefully and leave enough wire length that you can try again if you make a mistake.
How tight should the terminal screws be?
Tight enough that the wire does not move when you pull it with moderate force, but not so tight that you strip the screw or crush the copper. If you are using a screwdriver, stop when you feel solid resistance. A quarter turn more is usually enough. If you have a power drill, do not use it—hand-tightening with a screwdriver gives you better control.
Is it safe to repair a plug on a cord I use every day?
Yes, as long as you follow the steps correctly and test the cord before using it. A properly repaired plug is as safe as a factory-made one. The key is making sure each wire is in the correct terminal, fully inserted, and tightly secured. If you are uncertain about any step, ask someone with electrical experience to check your work before you plug it in.