[rohrmann]

The auto reset breaker with the red cover is one of the original breakers, and this one powers loads that do not come from the main panel. The manual reset 80 amp breaker replaced the original 40 amp breaker that was installed that powered the hydraulic pump and the main power panel. If the hydraulic system only works when the shore power is connected, but nothing when on battery only power, the most likely problem is the breaker that feeds the hydraulic pump, because the 12 volt feed from the converter, that is powered by the 120 volt shore feed, is coming to the load side of the breaker, and through the common connection to the hydraulic pump. If the breaker was making a connection, then the batteries would power the system, assuming the batteries were still charged. With that breaker not working, the converter will not charge the batteries. There is still a possibility that there is an open connection coming from the batteries, or an open ground, which is fairly simple to check with a volt meter