There is a ground terminal nearby.
I received a PM request to post this info again since the images went away for some reason so lets try this first:Based on my experience with an early 2015 how long the sockets stay energized depends on the age and condition of the battery. I use mine to power a data acquisition system for autocrossing and need to keep the main gps active all day. In 2015 the sockets stayed energized but in 2016 they shut off too rapidly.
If you really want to give up the "don't drain the battery protection" for those sockets it can easily be done in a 2015 but you should verify that the later cars are wired the same as an early 15. Note that nothing else is on the circuit and the "hack" keeps the fuse protection!
The "pink" wire at the bottom left of the photo is the jumper. I used #10 awg wire due to the fuse rating and in case I needed to power something like a 12 volt vacuum or air compressor.
The car is back to original now since it will be traded for an 18 in a couple of weeks.
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