Tail lights won´t turn on

Hi all,
My tail lights don´t turn on. All other lights are working properly, brakes lights work, turn signal and reverse lights work but tail light.

I tried changing the bulbs even though they look good, and didn´t fix it.
I´m thinking it can be the fuse for this lights, but I don´t know how to recognize it between all the fuses I have.

My motorhome is a 2005 Georgie boy Landau 35ft and the 12V fuses boxes is located besides the steering (according to the owners manual).

Any tips on how to identify the tail lights fuse? changing this will fix the problem? could it be something else?

Thanks