Mystery knob behind / under glovebox

[Claytonk]

While trying to troubleshoot a blower motor not working I found this knob under the dashboard behind the glove box it's tied into a 30 amb relay and seems to almost have a thermocouple coming out of it with a knob that you can turn on the bottom ? I solved the blower motor issue it was a bad blower motor relay, but what is this knob for?

 

[Claytonk]

Forgot to mention 1982 FJ60

 

[JoeW]

Looking at the wires and spade connectors, it doesn't appear to be factory. I guess it's time to start following the wires.