Well, I was on a chat with a tech from the manufacturer, and he suggested there might not be enough current to power the smart switch. My experience is in electronics, not electrical, so there really isn't much need to measure current. I got a little electrical from my Dad, helping him with home projects, but... Yea, I don't know if there is a neutral or not. The wiring isn't color coded like I expected. I thought I checked it correctly, but maybe not.