You can barely see the power supply in the bottom pic. The power supply converts 120V AC to 12V DC, which is what the fan runs on. I have it wired in the pressure switch to supply 120V to a regular house type plug that I mounted up under the frame of the compressor. I made the bracket to mount the cooler and the fan and painted it with a spray bomb from Home Depot. The paint matched the Quincy Blue just about perfect. I saw this mod on a You Tube video that a guy who has put up. He listed all of the stuff needed in his description. His video makes you want to :BangHead: it's so drawn out, but his idea and execution were great. He ran the AC wires from the power supply straight to the pressure switch. I changed that part and ran a piece of 14 gauge Romex from the pressure switch up to a standard outlet so I didn't have to get back in the pressure switch if the power supply for the fan ever took a dump. If it does, all I gotta do is unplug it, plug a new one in and test the 12 side to make the fan rotate correctly, since wiring it backwards will make it spin wrong. I have it blowing thru the cooler instead of sucking air thru it.