One light switch in a 3 gang box trips the breaker every single time. This switch is for 3 exterior lights. All other switches and outlets on this breaker work fine.
We moved into this house about 10 months ago and this switch has been doing this from day 1. Our neighbor said the previous owners used to turn the lights on all the time.
I have tested the breaker and it reads 120V. I have replaced the switch and tried removing the bulbs but no improvement. The only time it doesn't trip is when I leave the first fixture on and remove the other 2.
So, I disconnected fixture 2, left the wire connected. Breaker still tripped. Disconnected the wires between 2 and 3 and left 1 and 2 connected. It tripped.
Breaker does not trip if only 1 and 2 are connected. I also tested fixtures 2 and 3 by connecting them to the second spot and they both worked. So, the fixtures are good. All the bulbs work as well.
Fixtures 2 and 3 are on both sides of my garage door. It seems the wires between 2 and 3 could be faulty. What is the best way to check if the wire is faulty or damaged without breaking the wall? It seems like the wire goes above the garage door.