Hella Air Horn Problem

Sup guys,

I have a Hella Air Horn set up to sound off when I hit my car horn and when my alarm goes off. However, recently I noticed that when the alarm goes off the air horn sounds low almost as if its dying out however, when I hit the car horn it sounds perfectly fine. It's been like this for a few weeks now. Any ideas what can be causing this?

Thanks

I think it could be the battery doesn't have the power to blow the horn at full blast, maybe the battery is a little older and doesn't hold the voltage anymore or maybe the horn just uses too much power.

The battery is about months old. I never had this problem before.

Have you checked B+ at the the alarm circuit?