From my understanding of potentiometers, either side lead and the middle should work. The pots split the input current between the middle lead and the outer two leads depending on where the knob is. As as you turn, one side drops in current while the other increases. So hooking to the other lead would mean that it would work the same, just the knob would turn the oppisite direction to dim.
But my electricial is a little rusty, so I may be wrong. Someone please correct if I'm way off. :smoking: