12 volt landing gear problem

We have a 2013 3596RE Big Country and are having problems with the hydraulic landing gear working on 12 volt. The system works fine when plugged into shore power; I did have to replace the switch that raises and lowers the gear a few months ago but used the same style and power rating that was on the old switch. After I had replaced the switch the system worked fine on 12 volt for a few trips and now doesn't have the power to operate; I have also had the battery checked and also checked all the fuses that I know about. Any help would be greatly appreciated!!

Thanks,

Rob