I recently had a similar problem with my 89 Probe GT.
The power for some of the exterior lights goes through the headlight switch. In my case, water had gotten into the tail light and shorted out a bulb, somehow the short traveled up to the switch where it fried the wires feeding power to the switch.
I had to tear into the console and splice in a new plug, good as new now.
Monday, May 28th, 2007 AT 3:49 PM