I second Mrwilsn.
There are two 12V accessory plugs. One SAE, the other is the sumitomo(something like that, 2016) that the zero accessory kit uses, I think. There is also an old Harley (Buell) part number floating around for a sumitomo plug to cigarette socket. If your lucky you can find one and it should be cheaper than the price listed with Zero for effectively the same plug. I searched all of North America. Sold out! You might have luck down under.
That said, the SAE connector is probably the easiest. Bit of a PITA to find for the first time. Mine was zap strapped tight to the frame. You can split it easy enough to multiple accessories as needed. For example, I have my SAE split to a cigarette socket and another SAE that I attach an adapter for 12V heated gear. As long as I don't pull more than 15A(?) I won't blow the fuse and everything is peaches. 12V accessories fuse is in the fuse box under the seat.
Hope that helps!
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