I have a four way switch. I pigtailed two wires with the source power wire. One pigtailed wire is connected to the common screw terminal for power to the four way switch which is a three screw terminals. The other is connected to give power to another switch for the outside light. And all neutral wires are connected together.
These two switches are side by side in one double-gang box. The four way switches have no problem to turn on and off at three different location. But the outside light could not work independently by itself. It only works when I turn on the four way switch. What have i done wrong?