Do they turn on the actual fog lights, or do they turn on the US Amber marking lamps? Pulling the switch out would activate the actual fog lamps like shown in this pic:
http://mercedesw108w109.com/img/cars/unknown-300sel.jpg

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k