Bathroom with a single GFCI outlet on a dedicated grounded circuit. I want to take a light switch and outlet that are currently on a different, old, ungrounded circuit, and put them on the newer, grounded circuit. There are "out" screws on the GFCI, but no "out" for the ground. The wiring from the light switch to the fixture doesn't have a neutral. I think I do this, but I've never wired anything before.... Run a cable from the GFCI to the switch. I guess I put two grounds under the same screw on the GFCI (???). The hot and neutral connect to the unused screws on the GFCI. Connect the hot to the light switch. Splice the unused neutral and ground and the hot from the light switch to a cable. Run that cable to the new outlet. Splice together the old, 2-wire cable formerly running into the light switch and out of the old outlet, so that older circuit is maintained (there are other outlets on it....this is a pre-WW2 house). Help!