I'm having a little trouble with a set of lights that I customized the length of. Hoping someone can help me out. They are LED C-9 lights. There are two wires coming from each plug, but there are three wires running between the first and last light in the string. I cut the three wires between two lights and now want to add a plug back onto the string where I cut it, going from 3 wires to 2. I have tried connecting the wires in all different ways and have found one way that definitely does not work, it blows the fuses. I can even get all the other sets connected to this set to work, even while this one will not. Any thoughts?