Electrical Questions? Ask an Electrician Online.
Hello welcome to Just Answer, my name is ***** ***** will be happy to assist with your electrical questions.
What make/model is your new gfci/switch device? Any pictures of the existing wiring?
Is the old switch still connected?
Does the red or blue wire come from a group of connected wires? Or just straight from a cable at the back of the box?
With a red blue white and ground ?
And is this gfci/switch the only device in this box?
Do you have any type of voltage tester?
Can you test to see which one of those wires is powered
Oh ok. Well that's fine, you can test it when your ready. But the wire that is powered and one of the black leads from the switch can both terminate under the brass line screw on the gfci. The wire that is not powered will connect to the other black lead from the switch. The white wire will terminate under the silver line screw on the gfci.
How did you make out? Please let me know if you have any other questions or concerns.