Changing a bathroom pull cord switch. Made the schoolboy error of not noting the connections. I have 2 earth wires and 3 red wires. Connected the earth on new switch and worked out that one of the reds is the neutral. The two live wires I have tried in L1 and L2. The bathroom light comes on but won't switch off. When I pull the cord the upstairs lights come on and off with each pull of the cord. Anyone able to advise. Thanks