No, the connector in question looks like this:
It's located behind the passenger (right) rear side of the shock tower behind the carpet. If you have the powered liftgate, it goes into a black box with an additional connector. If not, it's disused and taped to the harness.
Pin 8 is the +12v (hot always). It's a Red with Grey stripe 2mm conductor wire. It's fused by a 30A fuse (Fuse #42 located in the fusebox shown below). The ground is pin 7, a black wire, also 2mm.
This feed can also be picked up in the large grey rectangular connector located behind the passenger kick panel in front of the passenger door on the right. Still the same Red wire with grey stripe, on pin #3.
If the liftgate isn't in operation, it's safe to draw up to 30A on this system. If the liftgate is in operation, I'd limit my max draw to about 10A peak. Since the liftgate only operates very intermittently, it's usually fine for electric coolers, HAM equipment, etc. Note that this is not switched, so it will draw on the 12 volt AGM battery when the car is sleeping. The gateway monitors the voltage of the 12v system with a check every hour. If it detects a low AGM, it will place the car in support mode to recharge it using power from the main pack. However, since it's only checking every hour, if you have a substantial load, it could run the AGM down before the gateway notices, and you'd have to jump the car to get it going again. I recommend turning off "energy savings" and choose "always connected" if you are running anything more than small standby loads on the 12v system while the car is off. You can tell when the car enters support mode, as you hear the contactors make the "clunk clack" noise under the car.
