In brief: in replacing an old light switch in an old house with a GFCI combo switch/outlet, facing existing wiring that doesn't quite match instructions, I get the GFCI outlet working but not the new light switch. What else do I need to test or install?
I'd like to replace an existing light switch with a Leviton combination GFCI outlet and switch.
On one side of the old switch, I find
black wire #1, confirmed hot with my voltage tester, pigtailed with
black wire #2, confirmed not hot, going I know not where
On the other side of the old switch, I find
- black wire #3 (that I see runs into a white sheath in the box), also confirmed not hot.
The old switch works, and when I patch black wire #1 and black wire #3 together (circumventing the switch) the light goes on, so I know that black wire #3 is the load wire for the light.
I also see that the box contains three white wires that have been capped together.
After some back-and-forth, I've correctly wired the GFCI outlet:
black wire #1 into the GFCI Line hot terminal
pigtail capped into the three white wires into the GFCI Line white terminal
My GFCI tester says that works, and it tests/resets fine.
However, no matter how I wire the switch leads or set the switch, the light stays off.
I'm following the "two cable" instructions, since I have no downstream outlets to connect.
The receptacle has two black leads for the switch. Per instructions,
Connect the switch leads to the switch controlled LOAD (not GFCI protected, shown in diagram):
One black switch lead connects to the LINE side black wire.
The other black lead connects to the HOT side of the LOAD.
The LOAD must be properly connected to NEUTRAL and grounded.
This puzzles me in two ways: first, that it doesn't seem to matter which lead goes to the load wire of the light and which to the line wire, and second, that, in my situation, I can't be certain that any of the white wires in the box are the Line (return) from the light.
I've tried wiring the receptacle switch leads in various ways, none of which got the light on, ending with this configuration which seemed most correct:
first black lead capped with a pigtail connected with the original 3 white wires (instruction #1)
second black lead from the receptacle capped with black wire #3 and a wire grounded on the box (instructions #2 and #3)
I'm also not certain what to do with black wire #2 above. I've capped it with black wire #1 and connected both with the GFCI Line hot terminal. The GFCI outlet continues to work fine, but no joy on the switch.
What else do I need to test re the existing wiring?
How do I get the switch to work?