Weird battery power problem

Thanks for the replies. I did replace the switch and I again have battery power! The photo doesn't show it, but the wires are held in place by a clip just out of the photo, so shouldn't be any weight on it. However, the mounting bracket of the dead one was bent a couple of different ways so clearly it had some stress on it at some point. Hopefully the problem is solved, and I learned something in the process.

Good idea about the separate power line for the jacks, too.