Yes I think running them directly from the battery is your best bet with large enough gauge wire to handle 4 with a fuse. I would put them in the glove boxes. Four cigarette lighters in the fairing would not look very good IMHO.
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2013 RGC Candy Orange, 2005 Deuce (Traded), 1991 Sportster (sold),1948 Pan Head Hard Tail (sold and wish I didn't),1971 Honda 500 Four (original owner), Too many more to mention