2005 pektron / sounder problem

I noticed that the rear fog light on my tf was not working so after some research on here i then tested alarm sounder/horn niether were working. I orderd new relay's and fitted them last night, I now have fully working fog light (rear) but still the horn refuses to sound when alarm is triggerd, hazzards flash and thats all there is no internal sounder and horn wont sound...Horn works fine using button on steering wheel. Is there anything i have overlooked or another way of retro fitting an alarm sounder.........Thanx ken

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