Accessory bus bar doesn’t have power

[Viking76]

I wired up an overhead stereo in my 2022 XMR after adding roof power cable.  I wired the roof power cable to the bus bar under the dash but it doesn’t have power (verified with test light). Do I need to add a fuse under the hood?

 

[Andystoy19]

I believe that the bus bar under the dash has two sources of power one battery power always on and one key on. If no power to the bus bar at all check the 40 amp fuse under the front hood panel.

 

[rclowe]

I have a similar problem, only I lost power to the accessory buss.  Is there a hidden fuse that I am not seeing?