ok got a little fed up with my stock horn today so i went to the local junk yard and picked up a horn off of a gmc suburban, everything was going great until i hooked it up and didn't here anything...blew the fuse, ok so i removed the stock 15 fuse and put a 30 fuse in plugged it in and got a clunk/click sound. is the horn bad or is it because it is not a toyota part???let me know should i go get a different horn from the junk yard....let me know

 

With 12V push that horn is being pumped with pressure which is Electrical Current. Your horn is not sounding for for 2 reasons. First reason would be damaged horn. It is possible that the coil has burned in the horn which magnetically attacks and repels the diaphragm that creates your sound. More current is being supplied to your horn to charge that coil but with no end result. Thus fuses blowing in succession until more than 20 AMPs and less than 30 AMPs of current is giving you that faint sound. Second is an alternate path to ground. Is this horn ground through the case or does it have a remote source of grounding? Did your stock horn work? Possible cooked relay, damaged wire finding alternatate path to ground...

I've seen it here horn would be replaced and install in an incorrect position. The sound port to the horn would be facing in a direction where junk can get in, stoping the diaphragm from moving feeding more current to it while not getting a reaction, current then will exceed the Ampage of fuse blowing it. The possibility of it being from scrap may have allowed crap to get in there. It's not bad becasue it's not Toyota, anything will work at long as it runs on a 12V system.