I went digging under the seat yesterday, getting to the battery to install a battery-tender harness and I discovered that there is already a charging harness pre-insttalled from the factory! Awesome! Just another detail that makes this stand out in my mind. I'll bet Harleys don't come equipped like this..
Sorry to steal your excitement, but that is not from the factory. I never did spend much time doing set-up work at the dealers I worked at. But I have pulled Raiders out of the crate and set them up myself (including my 2010). I can't speak as to the 2012's or 13's but up to 2011 they didn't come with charger leads and I doubt they've started. It's something your dealer did during the setup since they have to install the battery in anyway, they're right there why not. Which is nice, I've worked for a shop that did this for every unit, and you're a testament to customer appreciation FYI, the auxiliary DC connector is the two pin connector under the seat with a red lead and a black lead that probably still has a dummy plug in it. It's a factory convenience feature to easily access battery power for an accessory.