Home Security Systems
Home Security System Repair Questions? Ask a Technician.
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Obviously, you should test the wiring in the walls. If it is shorted, then when disconnected at both ends, and tested at one end (either end) with a volt meter set to measure Ohms of resistance, the meter will show zero or nearly. If that wiring is defective, then you might have to install a wireless sensor there... or run new wiring? I doubt that would be considered effective, but I throw it into the heap of things to consider about the solution to this.
Getting *one* wireless transmitter to tell your alarm system whether *any* switches of the eight in-series are opened, sounds like the best approach.
Here's one, not very cheap, example (of a wireless window sensor):