https://fuse-box.info/gmc/gmc-yukon-2007-2014-fuses-and-relay and scroll down to the 2009+ section:
Underhood fusebox. # 53 Cigarette Lighter, Auxiliary Power Outlet
Instrument Panel fuseblock
#2 Rear Accessory Power Outlet
#16 Accessory Power Outlets
Underhood fusebox. # 53 Cigarette Lighter, Auxiliary Power Outlet
Instrument Panel fuseblock
#2 Rear Accessory Power Outlet
#16 Accessory Power Outlets