I was changing out old switches in an old apartment when I came across this enigma. Switches in the kitchen and hall both operate the hall light. The switch in the kitchen was a regular 3way switch job with a red, a black and a white wire. The switch in the hall had four wires, 2 black and 2 white. I replaced this with a 4way which my husband said was incorrect. In the mean time until we find the correct type of switch (which I'm open to suggestions) we put the old ones back on but must have messed something up because now the kitchen switch only works when the hall one is positioned "down". I have multiple questions. What is the red wire hooked to? None of the wires in the 4-wire box read 110v so which one is the power coming in from? I'll stop here for now. Thanks.