If your tow lights are not working this is the fuse to check.
Showing the position of the underhood fuse box.
Number #26 is the 25amp fuse at the extreme left.
If #26 is OK, check two of the relays in the box mounted on the firewall directly behind the fuse box pictured above.
The relays you are concerned with are the two of the right-hand side - trailer tow relay left and right.