The actuator for the couple/uncoupler is located at the front left driver's floor in front of the seat. It's mechanical - no power needed. You either pull, or push the knob. By looking under the car at the driveshaft as another person engages/disengages the coupler, you'll see the mechanics of how it works. It's only necessary to fool with, when you want to tow the car - four wheels down. You have to remember to one-turn the key lock ignition so the steering assembly of the towed car tracks the vehicle that is towing it. If memory serves, it cost over $1,500 or so for Remco to install 23 years ago, so it's not a cheap deal. Just the best of it's kind for an auto trans. vehicle to tow four wheels down, in an instant.