Air circulation issues via controls

So my air circulation button never stays lit longer then 10 mins when's I'm driving, it always goes off and air is constantly flowing, I did the fog light mod when I got the truck that's my only mod with any electrical work involved... Any ideas? I don't have an inline fuse with the mod pretty much just a wire involved.

 

Check your owners manual. I think you're referring to the auto-recirc disable feature that prevents window fogging in colder temps. When the recirculation light turns off, turn it back on and hold the button down for five seconds. It should stay on until you restart the truck.

 

Does it with the AC as well even on the random 60 something degree days we've had in here in Jersey