I was troubleshooting a pool with 4 lights in in and when I put the gfci load that was through a time to each light they individually worked, but when I tied all of them together it would trip. There was one light that needed a gasket to be sealed behind it and was thinking that maybe it was looosing or gaining some type of induction to the other lights through the water, which was causing it to trip. I checked for continuity between the neutral and ground of every light and between all of them and nothing. The timer had to be changed due to malfunction and I also switched out the breaker and was getting the same thing. Can someone please help me understand why this is happening.