BAD NEWS FOR YOU <---

the output circuit of alarms are supposed to blink PARKING lights only. NOT power headlights or foglights. The parking lights are like 5 watts, 12 volt bulbs. Your foglights are probably 55 watts.

When your fuse blew, the parkign light output of your alarm also blew at the same time. ITS NOT MEANT to handle or drive that kind of load, it was never designed that way