Wiring Diagrams for GFCI Outlets - Do-it-yourself-help Wiring for a switch and gfci receptacle in the same box is also shown. To wire a gfci circuit breaker see this link and wire a gfci switch combo at this link. Wiring a GFCI Outlet and a Light Switch. This diagram illustrates wiring a GFCI receptacle and light switch in the same outlet box, a common arrangement in a bathroom with limited space. Wiring a GFCI Outlet with a Switch - Ask the Electrician Wiring a GFCI Outlet with a Switch. The wiring assignments for the new GFCI outlet are as follows: The brass screw is for the hot wire, and the silver screw is for the neutral wire. The wiring that you have described for the existing outlet should be verified because you have stated that the outlet is controlled by a switch.