Mazda 3 horn broken
 

I own a 2011 Mazda 3 sedan. Here is my issue/curse:
My horn started to sound progressively pathetic until it finally stopped working. Easy fix right? I go through the normal troubleshooting, relay, fuse, checking if connectors are plugged etc...-everything looks fine. Must be the horn. I replace it, wire it up proper. Then a few days go buy and I have the same issue. The horn sounds more pathetic and eventually dies about 3 days later or so.
So here is my question: what else can I do to troubleshoot this issue? I am going to grab a multi-meter and work my way back, hopefully I will find the problem. Also, does anyone have a wire map that I could use to aid in my search.

too long didn't read: horn died, replace horn, horn died again.