I checked everything on the circuit without tearing out every single light, but I found nothing. Everything checked out between the panel and the last fixture on the run. Continuity checks out, no shorts, voltage is good when energized. I'm baffled.
One thing I wonder about is the connectors on the fixtures. These fixtures had factory push-in type connectors on them and all of the wires are termininated to those connectors. Is it possible that a poor connection on one of these connectors is creating transients on the line and messing with the circuit? I would think if this was the case it would be visible in the fixture output by dimming or flickering or something like that.
Here is extra info about the 3-way switching scheme that maybe someone can comment on to see if you think anything is wrong here:
The first switch box contains the line conductors from the panel, the load conductors, and the travelers to the second three way switch box. There are 3 conductors and a ground to the 2nd three way, 1-hot leg and 2-return switch legs. (Note: the neutral does not extend through this 2nd three way switch box it only connects to the load neutral at the first box) I mention this because I'm wondering if that can have any effect on the circuit operation having different impedences on the hot conductor vs neutral conductor. This is a standard way to connect three ways and I've seen it done before without any problems, but I suppose I'm grasping for straws at this point. Does anyone see a problem with that?
Thanks for the input.
