RE: 2001 SLK 230, R170

My Fog Lights stay ON when the switch is turned to OFF and the key is removed.

Is there a relay in the fog light circuit?

Before I buy a new switch, I want to confirm that the fog light relay is not the culprit.

This happened while on an overnight trip, so in order to save the battery charge, I removed the fuse, which only controlled the fog lights, thankfully!

My “logic” says that the only way I can see that power is always ON in the circuit thru the fuse to the fog lights is if there is a short from power to the fog light’s switch leg. Hopefully, someone who is much more technically savvy that I am can answer this question for me!

Please advise and Thank You!
Bob