Batteries not holding charges

Motorhome house battery charging is essential to operating any motor home. Getting to know the location and understanding basic functions of the converter/charger, the house battery disconnect switch and relay, fuse and breaker boxes, how to check battery voltages with a simple multi-meter, and how to maintain battery electrolyte levels, is basic to having house battery power when you need it on the road, away from home. 12 volt DC supply connections at the converter/charger, batteries and at appliances, and other 12vdc devices must be clean, tight and make good contact. Most appliances need a combination of 12 volts DC for controls and 110 volts AC or Propane for main power. There are some helpful You Tube videos and generic "how-to" RV books. Nothing beats exploring and getting to know your own rig's 12 volt systems.