In some motorhomes, the steps are powered by the ignition switch so that they retract when the motorhome is in motion. These motorhomes also have a switch by the door that you activate so that the steps do not move in and out when parked and the side door is opened and closed. Also, in some motorhomes, the slides only work when the emergency brake is on, and the engine is running. As for the green light on the Inverter, this is not the same as a converter. The Inverter transforms 12 volt into 110 VC. The Converter does the opposite.