Originally Posted by GHen
Just confirm again what was said above, those little circuit breakers are 12 volt and have NOTHING to to with the 120volt 50amp shore power.
If the breaker is a 20 amp, replace with a 20 amp.
The one exception to this 'rule' is, if you have a Lippert leveling hydraulic system, possibly also with the hydraulic slides, there might only be a 40 or 50 amp breaker installed, and if the pump starts and then stops before an operation, it is possibly the breaker that is undersized. Lippert recommends the breaker should be an 80 amp breaker due to the high amps that can develop when operating the system. The 80 amp upgrade is a good proven change in breaker size.