In order for a 4 way circuit to work, the 3 way switches must be wired properly at the the beginning and end of the path. So be sure that the common terminal on one of the 3 ways is wired to the hot source, and the common on the second 3 way is wired to the the hot terminal on the lights.
Here a receptacle outlet is controlled with a single-pole switch. This is commonly used to turn a table lamp on and off when entering a room. In this diagram, 2-conductor cable runs between SW1 and the outlet. The source is at SW1 and the hot wire is connected to the bottom terminal there. The top terminal is connected to the black cable wire running to the hot terminal on the receptacle and the source neutral is spliced with the white cable wire which runs on to the neutral on the receptacle.
Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the top and bottom of a flight of stairs or at two different entrances to a room. On this page are several wiring diagrams that can be used to map 3 way lighting circuits depending on the location of the source with relation to the lights.
This is an older version of the receptacle in the first diagram. The slots are different sizes to accept polarized plugs, but it lacks a grounding slot. This device does not make use of a ground wire. There is no protection against electrocution as provide by the grounded receptacle.
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