Lets rephrase the question correctly. You should state--"I have one breaker that has NO VOLTAGE on it, but the rest do. NOT state a LOAD. A LOAD is a measure of power that the breaker is supplying. Do you have an EMS system? A 50 amp breaker panel in the RV has 2 separate metal panels the breakers connect too. They usually alternate so breakers in a row, every other one will be on the one 50 amp side. They do NOT have all one side supplying 1 50 amp feed. So, if you have a breaker that has NO power out of it, verify that there IS power on the flat supply bar the breaker snaps in to. You have to remove the breaker to do that. Did this breaker have power on 50 amp service before? WHAT made you check for a problem? What appliance or outlets were dead that made you check? Have you tried on the Gen set to see if power is there? Also, depending on HOW the system is wired, IF you have a large Inverter/Charger, THAT breaker may be the supply from the Inverter/Charger. Check your Inverter/Charger breakers if you have one. Doug