Chieftain, you go to any switch in your house (not a 3-way) and reverse the wires on the switch. It will still work!! A simple switch has no positive or negative. The screws aren't different colors are they. You can run hot straight to a light and put the switch in the return, or ground, or neutral wire and it completes the circuit when turned on. Or, you can run power to the switch first and then to the light or whatever fixture it goes to and you can still wire it either way and it still works. Don't you guys remember middle school science class where you learned about a simple circuit? The "switch" was a simple piece of metal that made contact to complete a circuit. That hasn't changed. Go ahead and change the wires at the switch. Those wires aren't positive and negative!! They are either the power going to the light and the current passes through the switch when on, or they are the negative or ground wires that complete the circuit to ground when turned on. Think about this just a little guys. A switch has not positive or negative unless the switch is a lighted switch that lights up when it's turned on. If that's the case, then yes, he may have the switch wired incorrectly. But simply changing the light fixture will never require changing the wires on the switch. Go ahead, change the wires on the switch. Still, current will pass through when on and not pass through when off.