Can't find switch for "driving/fog" lights

We have a National Tropical coach from 2008 that we bought just over a year ago. I was replacing a headlamp pod recently and noticed the low mounted "running/driving/fog lights" and realized that I have never seen them come on. I did check to make sure the bulbs are good. I can't find any switch for them either. The manual is for a generic theoretical vehicle and was supposed to have a supplement for the individual models but I never saw one. There is a picture but no information about the switch and no dash control information either. Does anyone know where the switch might be? National is gone so I can't ask them. I'd appreciate any info. It would be nice to be able to use them.
I am sorry, I can't figure out how to add photos.