thanks guys i aint too sure whats going on have solved it i think but will see,answering your questions i treid the air vent idea and it did not cchange things and the horns were dry as a bone guys the siren however under the bulkhead cover maybe faulty as i disconnected the plug into the siren and all is well the horns still allarm if anything is tampered with and hazzards all flash etc and system seems to be all working fine since i unpluged the siren part.so dont know if the siren was a add extra option which overrides the horn alarm system if fitted but it seems to be the sorse.all working ok sat inside car set allarm and moved after it was set and the horns all went off/set the alarm with bonnet up and held switch down and was ok let switch go and allarm went of so dont think disconnecting siren has effected anything.car starts runs normal.so hope thats was all it was unless you guys can put anymore light on subject about siren has it got to be connected or is it like at moment ok.thanks mike