I have recently added another light fixture to a switch that used to just control 1 entry light. Now that switch controls both of them & have found out that they are both dependent on having working bulbs in them to both work. If one is removed, or burned out, both will not work. My problem is I have 1 light that is working and the second light is either extremely dim or not even lit up at all. What can I do?
You need to rewire. The light fixture that you tapped into should be redone so that the three wires (power in, light fixture, power out) are all connected to each other.