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Is the a 12v power adaptor for the Yale easy fit siren EF-BX unit that can be fitted to the siren instead of the batteries ???

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Because your system is designed to operate off of batteries only, coming up with an external power supply to work around the original design becomes an issue. In order to do what you want to do you would have to have a rechargeable battery maintained by an appropriate charger that would run the system from the charger/supply, charge the backup battery and switchover to the battery in the event of a power failure. These do exist and one manufacturer is Altronix but there are several, you just have to visit a DIY alarm website and get recommendations bearing in mind the battery voltage your system is designed for and the amp hour rating necessary to keep the system running the duration of the power outage and beyond. Keep in mind the reason for your alarm system is security and compromising that with homemade non-UL retrofits might not be the way to go, your choice.

Posted on Dec 06, 2014

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Make sure the power adapter has sufficient capacity to provide the current the siren needs. Some adapters only supply enough current to charge the internal battery but not operate the siren by itself.. A power adapter with enough current can be fitted to the siren.

Posted on Dec 06, 2014

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Hi Anthony:
If you follow the power flow, it has to start at the battery, probably go to a fuse, then to a switch, then to the siren, and the siren should be grounded to complete the circuit.
It may be that your siren does not have a grounded mount, in which case there will be a ground wire that has to be connected.
If the siren is activated when the ground wire is connected, the switch is closed or is not functioning correctly.
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