We do not recommend deactivating the alarm as this is designed to alert you when a gate is opened or left unlatched. Please review the installation instructions included with the Magnalatch D&D Top Pull Alert for information regarding arming the product.
MagnaLatch does have an adaptor that can be placed on chain link. However, it does not work with our other latches. Please contact us directly at 800-716-0888 and reach out to the Technical Services Department.
You cannot add the alarm to it. The version with the alarm is built in.
I'm having the exact same problem on BOTH of my locks that I had installed a couple summers ago.. contacting the manufacturer. I can insert the key and it will turn part way, but then it stops and I can't unlock gate.