[wrxnofx]

While I've not replaced this switch, I believe it's the same switch as that of the door dome light switches. Assuming it is, it just crimps on to the back of the switch, with ground being provided between the switch threads and hinge threads. So you'd unscrew the old switch (holding the plunger so the wire doesn't twist in the hinge), remove the brown wire from the old switch, crimp it onto the new switch, and then screw the new switch into the hole while holding the plunger part so the wire doesn't twist inside of the hinge.

Sorry if I'm off base here...