Broken alarm wire
I have an elderly (30+ years) wired alarm system. It developed an opening in a loop which I have located to within a few feet, it is between 2 windows right next to each other. I know it is a broken wire or a bad solder connection. (I replaced the switches.)
I have temporarily fixed it by running a jumper between the magnetic window switches, but I would like to find the exact location of the break before I start tearing the walls apart.
The switches are about 3 feet apart, and the tracer tells me the wire runs under the sills. The tracer does not locate the problem.
I can remove the molding directly under the sill, but I expect I will just see a 2x4. If I must cut the sheet rock, I would like to do as little damage as possible.
I have not tried to measure the capacitance of the wire from each side as it seems to me that the wire is too short for that.
Any thoughts will be much appreciated.