Your water pump switch turns on your freshwater pump, should you not be connected to city water.
In order for the water pump to work properly, your 12v system must be engaged. You do not have to use the water pump when your RV is hooked up to a city water supply.
To learn more about your water pump, watch the video tutorial below.
Is there a How-To video you’d like to see? Let us know in the comment section below and check out last week’s How-To Video.