03+ switches absolutely positively will not work in a 2002 or older. Like Omar said, its not a positive and negative transmitted by them, its a data signal. Think of it like this, its more like a usb cable on a computer. It transmits data, not voltage. Now the actual mirror works off of voltage, but you would have to hardwire it to a different switch, since you cant use a 03 switch in your truck. On a 2003+, the switch sends a data signal to the computer. Then the computer actually sends voltage to move the mirrors, locks, windows, etc. It can be done, but a LOT of rewiring is needed to convert the mirror to run directly on an older switch instead of being computer controlled.