I actually recently went through the trouble of digging my autolamp mirror out of the garbage and I spliced the wiring back together to use it!
My light switch fell off inside the back of the dash, and I posted about it here, and someone asked why I still used that and not the autolamp feature. Apparently the mounting point for the switch is weak and prone to breaking. Hell! I didn't even know my truck came with an autolamp feature! LOL So almost a year prior I had thrown the stock mirror in the garbage because it was not mounted when I got the truck. There was a replacement mirror and windshield button included with the truck so I had used that.
After I found out about the autolamp feature I dug through my 55 gal garbage can in the garage, and found the sucker. The original owner had cut the wires, so I pulled down the sunroof control and found the wires, and spliced everything back together.
I LOVE THE AUTOLAMP FEATURE!