If you wire a 3-way switch wrong, you may be able to turn the light on from one switch, but not the other. It’s important to review how to wire a switch before attempting this project.

5. Connect your outlet Strip the ends of your wires clean to about ¾ on an inch and attach the black wire that goes to the light switch and a black jumper wire to the power source with a wire nut ...

Test the downstream outlet by plugging in the GFCI tester and pressing the test button. Note: The lights on the tester should go out. Fold the wires back into the box and screw on the GFCI receptacle ...