Outer Limits 4x4 Board

Just wondering if some can help me, I looking at wiring in to my horn for my alarm, as my siren has been mounted in side the cabin and when car is locked up the siren is not that loud on the outside. Can some body help me or should i take it to an auto electrian.
Thanks in advance

Pretty easy, pick up the wire to the siren and run it to a relay, then run from the relay to the horn. The horn is probably negative switched so you'll be switching the negative with the relay.

Don't try it without a relay, you'll probably kill your alarm.