I have 2 outdoor light fixtures connected to the same circuit and they are both wired to the same switch which has a built in timer. Both of the fixtures turn on and off when the switch is manually operated. The strange thing is that one of the fixtures will stay on when the switch turns the lights off in the morning.

I was having this problem on the old automated switch and replaced it with a WeMo Light Switch. The same problem is presenting on the WeMo.

The fixtures are 3 light 25w incandescents and seem to be identical. I have also looked for any sort of daylight sensor that might be wired in, but haven't found anything.

Anyone have any thoughts of where I could look for the issue?

Thanks,

Chris