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That's a really vague question. Did you check the wiring? Is it getting power? Do you have loose connections? Is the fuse blown? It could literally be anything, if you installed it yourself then you should be able to know where all of your wiring is to check.
I put a mini beast on my RK a few years back. It was great while it worked but it stopped working after about 6 months. I messed around with it a bit but never figured it out. Pulled it off and put the stock horn back on so I could keep riding.
A couple guys told me the relay probably went bad. The entire "Beast" and the wiring cable are still sitting in my garage wrapped up in some foam wrap for safe keeping. I forgot they were there and then saw them in the top of my rolling tool box the other day.
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