Hopefully straightforward wiring question, but I can't seem to figure it out.
In my kitchen we have two ceiling light fittings. One has white, black, & copper wires, the other had white, black, red and copper.
There is a two way (on/off) light switch on the wall which causes power to flow through the white & black wires in both boxes (tested with a voltage detector).
I hung lamps on both fittings, wired to the white and black wires. The light attached to the first fitting (only white and black wires) works fine, but the light attached to the second fitting doesn't - light doesn't come on. I've switched bulbs, and switched the whole pendant, to make sure neither is defective, and in all cases the light attached to the first box lights up, the second doesn't, despite the voltage detector showing the white/black wires are hot.
In the second box, with the non-working light, the volt meter shows that the red wire is always hot.
Am I wiring up the second pendant lamp wrong? Should the always-hot red wire be involved, and if so with which other wire?