I moved into an older home and i am trying to add a GFCI in a kitchen outlet by the sink. Its a two gang box with a switch and one outlet, it has 3 lines coming into the box, two go to the light switch and only one 14/3 wire connecting to the outlet.
On the 14/3 wire going to the outlet both the red and black wires are live. the way it is connected currently the neutral is shared and jumped at the outlet (picture attached).
How can i install a GFCI if there are two hot lines?
