I want the horn to sound when I arm

I had installed a Performance Teknique ICBM 7071 but It doesn't have a horn output can I make the horn sound when the alarm goes off and when I arm it with a relay??????

And can you tell me how to wire the relay thnx to anyone that can help

first of all, do you have a siren output or light output in that alarm system?. does the lights flash once to arm or to disarm, only then i can provide you the information onto how to wire it with a relay.

on most alarm harneses its the BROWN / white wire. most are -neg. and will need a relay.

connect BROWN / white  to terminal 85, connect relay terminals 86 & 87 to +12v constant power. connect terminal 30 to your horn wire.

if your horn wire is -neg then just use your BROWN / white wire. use a probe to find out

or you can use directed web site for a print out of your wiring and locations of the wiring to find out.

you can use the light output, the siren output and the central locking wires (negative switching output using diodes but with all these, you will have to use a relay to drive the hight current to the horn honk.

hope this helps