Trailer light fuse box

Its behind the airbox. There is a small box for towing-package vehicles. Remove the black plastic cover from the top.

from what I read on Etrailer and have located on my 2019 Ridgeline... the trailer fuse box B is located in the engine compartment. Facing the rear of the truck with the hood opened, the box is located just to the right of the center of the vehicle (a little to the driver side of the truck) in the rear of the engine compartment. This seems to be a dedicated fuse box for towing/trailer fuses/relays etc. https://fuse-box.info/honda/honda-ridgeline- 2017-2019-fuses most of the fuses seem to be located in position 3 thru 11. Good luck