I’ve added a diagram to hopefully illustrate what I’m trying to describe.
I’m wanting to add a 3 way switch to an existing ceiling light switch and I’m having trouble just understanding the current configuration. I currently have a wall switch that controls the ceiling light on the porch. The switch is near the kitchen door and I want to add a 2nd switch that is closer to the exterior door. I should mention that my house is about 80 years old and is mostly re-wired but still has some knob and tube left. The existing wall switch is only connected to 2 knob and tube wires that come up from the basement– one to the power terminal and one to the neutral. Since there are only 2 wires, I assumed the power must be coming to the light first, then to the switch. But there is a breaker box on the porch wall (no breakers – just used to house the junction boxes). It has 2 junction boxes in it with at least 4 or 5 wires coming in. I found that when I disconnected the 2 knob and tube wires on the right (see diagram), it kills power to the ceiling light (and several others in the house) but the switch still has power so I don’t see how power could come to the light and then to the switch.
I’m completely confused. Can anyone help me sort this out?