Join Date: Jul 2013
Location: Phoenix, AZ, USA
Thanked 27 Times in 23 Posts
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It's your battery. I also have an '09 ABS, and it's running fine - but my 300 wasn't, and pulled the same thing on me today when I was trying to sell it. That buzzing noise is really ****ing annoying, but also can't be confused with anything else, so at least you know what the problem is right away.
Took it to a shop, had it tested - voltage was fine, amperage was not. Had to replace the battery. My prior experience is that even if you get it to start at this point, it may not hold a charge and you'll be stranded somewhere when you go to start it up again to head home (as is what happened to me). Best to just replace it entirely. Save yourself the headache and hassle.
And next time you plan on letting it sit for that long, disconnect it and bring it inside to be stored at room temperature until you're ready to ride again.