White Rocker switch right side entry FR 2017 EVO T1850
The white switch is an exterior amber step light, impossible to see lit during the day.
None of the 120v receptacles or microwave run off of the battery in a factory configuration, neither does the air conditioning. So if any of that equipment is working you have 120v power from a generator or pedestal.
Just watch the clock on the microwave that is the only indicator you need to monitor the presence of 120v power.