Hi kiddruger,
There's a row of 12V DC mini-circuit breakers located near the battery. At least 2 of the breakers will have thick wires; one going to the power converter and the other to the hydraulic pump. See attached picture.
The one going to the power converter has a matching thick wire on the input side of the breaker. The wire to the pump gets power from the copper buss bar that runs across the bottom of the breakers.
The breakers often have rubber boots covering them and the orientation varies.
Replacing a breaker is pretty easy. Just make sure battery power is cut off or cables disconnected. You should be able to find a replacement 50 amp breaker at either an auto parts or marine store. Look for an auto-reset breaker with the same mounting orientation.