Clifford backup siren install

I have read a previous post dealing with the wiring for Clifford backup sirens that went like this:

black = ground

red = alarm's 12v constant

yellow = trigger

white = to battery or other constant power

This was for an alarm with negative siren trigger. My alarm has a positive trigger, how do I wire the siren in this case?

Thanks.

That's easy.......... just use a relay to change from positive trigger to negative trigger.

Pin 86 and 87 to ground, pin 85 to positive trigger from the alarm system, pin 30 goes to Clifford Backup Siren (Yellow wire), and pin 87a do not use.

Ok, I was just wondering if the siren itself could be hooked up with either a + or - trigger without the need for a relay.

Here's another question: My horn honk output is - trigger, is it possible to hook up more than one siren to negative trigger outputs without the need for an additional relay? I was banking on having to use a relay anyway, maybe I'll just run all of the sirens with negative triggers.

Is there any advantage to running the horn honk output just for the horn and the siren output just for the sirens or is it just a redundancy issue?

Thanks.