Hi, I had this system installed about 20 years ago,with a remote keypad, the system works fine inside the house at present,some time ago the strobe overheated (got damp) and blew a fast blow fuse,at the time this fuse blowing also unpowered the keyboard so I pulled a wire off in the main board that stopped the outside alarm. Can't for the life of me remember where it goes now!!I have fitted a new strobe in the outside box ,the 5year battery is still ok but if it all works I will replace. I have all the paperwork ,engineer code, diagrams ,installation book etc, Do we have on board someone who has experience of this installation ? I can send a foto of the board (mobile phone) and terminals where I think the wire was moved. I can get into it all but my old brain just refuses to work now .I have test equipment from when I used to do just about anything.