I assume you checked the bulbs..they're ok?
Possibly the Stop lamp Switch
Another possibility is a faulty Multifunction Switch
The Multifunction Switch controls the Turn signals, Hazards,Dimmer,Wipers ,Cruise Control.
Multifunction switch is $168.99 + tax at Autozone
Stop lamp Switch is $7.99 + tax at Autozone
(This post was edited by JIM N on May 11, 2008, 11:39 PM)