No Cruise Control when running Wipers

I have noticed when I am in cruise control, and I start the windshield wipers, the cruise control drops out and I cant turn it back on. If I turn off the wipers, I can start cruise again. Is this a safety feature, or maybe a switch going bad? Sometimes I can cruise when running the wipers on pulse, but if I increase the pulse rate, the cruise drops out. '87 Lesabre. Anyone had this problem?

The switch is either going bad, or the wires leading up the steering column have shorted out. Make sure the fuse is the correct one.