What I see looking at the right hand 50 amp CB sure looks incorrect to me. The left side of the CB obviously ls has two wires attached (both with black plastic crimps). One goes up to the 80 amp CB and then off to the pump. The other goes down under the floor to the fuse panel.
The right side of the CB has a yellow plastic crimp line from what has to be the battery (not enough detail in photo to prove it). The only way for the two lines on the left side (Load) to get 12V is from the line on the right (Bat) through what has to be a dead CB.
Hopefully the below picture shows what I think I see.
