My horn is going with seemingly no cause and wont stop unless I disconnect the battery.
Check your fuses. It varies from car to car but you may have a fuse dedicated only to the horn unit. In that case you can just pull the fuse without affecting anything else..
Other than that you will need to pull the wiring connectors off the horn unit and tape them up to keep any moisture and dirt out. Hopefully that will not trigger any issue with the security system.
Disconnect the wire from it. Sound like you need to reset your alarm system. Mine goes wacky when you fool with the battery.
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