[ChuckS]

Locate the center post on the dual polarity solenoid on your hydraulic pump ...follow the large cable down its path to the resettable breaker it’s attached to

Go to NAPA and get an 80 amp resettable breaker and replace that breaker you located previously.

This will fix the problem you are having. The RV builders are installing 5” amp cheap resettable breaker and it will not handle the potential current draw that can often occur when running the slide outs...

Until you replace the 50 amp breaker with 80 amp breaker you will continue to have problems and they will only get worse

Especially in cold weather...pic is what dual polarity solenoid looks like. Post circled in yellow is DC 12 volt plus feed cable from the resettable breaker that you need to replace with 80 amp breaker