I have a new 2004 cedar creek 30ckts. Inside the front door is a bank of four switches. The first one closest to the door is the overhead lights. The second and third are the porch light and scare light. Does anyone know what the 4th switch goes to? We don't see anything happen when we turn this one on. It is the left switch in the picture. The one that is in the off position. I guess since the picture is sideways, it would be the bottom one.