ANSWER: Hi Dieter, a 12-volt battery disconnect switch is used to shut off all 12-volt power in the RV. When the switch is activated the batteries are disconnected/isolated and no longer supply 12-volt power to the house portion of the RV.
A Factory Installed Battery Disconnect Switch is usually a rocker switch that is located in the RV marked as "Battery" or "Battery Disconnect" or any abbreviation of those words. There are also Aftermarket Battery Disconnect Switches (like the one pictured at the top of this page) that can be installed directly on the house batteries.
For those of you that do not have a battery disconnect switch on your RV, you should watch the video below to see how easy it is to install an Aftermarket Battery Disconnect Switch on your RV.
If you find out that your problem is not caused by an activated Battery Disconnect Switch it could be that your house batteries are no longer holding a charge or no longer being charged or even a blown fuse. The problem could also be caused by low electrolytes in the batteries or loose connections on the batteries.
I hope this helped.
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