12v constant supply location? - Trunk

[brettF]

Hi members, I have just acquired an 2011 X6 E71 and unlike my old E53 the 12v socket in the back is only on when the engine is running.


Is there a location I can tap into a 12v supply to run aftermarket trunk light and small fridge when need be.

Ps: possibly this has been covered but my searches haven't found anything.