corrosion on back No evidence shows from the outside of box...all fuses work when you pull fuse block the only evidence you will notice is shown at the bottom of backside of fuse block, see area on bottome of pic on right side.. this is where the pins come through the block, the fuse block sits at a perfect angle for water to pool in bottom , you can see corrosion on right and will notice rust and corrosion on pins. we had to drill out the 2 bolts connections to get block apart,