Spent several hours locating the cause of a wall sconce light fixture failure. Was it the dimmer switch? A loose connection? A bad wiring glitch? Keep in mind I installed this fixture back in 1990 and it worked for 30 years. It could be anything.
The fixture has been out for 2-3 years, but my Granddaughter claimed it didn't matter. Well yeah, it did. But, I couldn't get to it with all her stuff in the way. Twice I replaced the bulb several times, but they never lit up.
Two weeks ago, she moved out and went to her mothers to live for a while. Today, I decided was the day.
After pulling out the dimmer switch. It checked out. So, I went up the circuit to see if there was somewhere, a break in power. Everything checked out all the way to the junction box where I had installed a ground fault to meet code for bathroom circuits. It checked out as well. Keep in mind, every time I tested power to ground, the ground fault went off. The circuits all appeared to be patent.
So, I went back to the light fixture. First thing, I checked the bulb. It was dead. But I just put a fresh one in today! So, I grabbed one out of a working fixture. Damn, it didn't light up. So, I put it back.
IT WAS DEAD!!!!
Now tell me that isn't weird.
So, I started at the end of the circuit and checked every connection for continuity. Re wire nutted every connection even though tha all checked out before. Put in a fresh new bulb and hit the switch.
Eureka!!!!
I will never know why or what I fixed, and it will be a ponderance for some time. But so far it lights up. The dimmer works and everything is fine.