Whats this ****??
newb here just bought a deleted 07 Ram 2500 Mega cab 6.7
Anybody know what this **** is??

 

Something added by a previous owner, along with that bracket feller next to it.

Welcome to DF!

 

Turn it, push it, pull it, etc and see what turns on or off. The bracket is to hold a gun.

 

Yep, that button is an add-on by the previous owner. You can trace the wire coming out of the back and it will either go to a fuse tap in the fuse box, or, it will lead thru the firewall to the battery.
I have a similar setup and put my light bar switch there.