No No it's not a muffler bearing switch......it's to release your turn signal fluid to your bulbs.
![ROFL (2) :rofl2:](https://board.marlincrawler.com/Smileys/marlin/rofl2.gif)
On a serious note, more than likely it's fod light switch os some kind lighting switch because got one just like it from the wrecking yard from a runner....it fits perfectly in the factory pre-cut slot. just make sure you have no power source going into it so it can't ground out.