wiper/wiper delay switch malfunction? any advice to fix?

[rrboy]

During my annual elk hunting trip and lots of wheeling in the mud and snow, I start the hummer and the windshield wiper fluid motor is stuck on and the wipers wont shut off. After playing with the switch for awhile, when in the off position, they are still on, when I switch to different speeds they dont work and then they do, all the while the fluid is pumping out. So I jiggle some wires and presto, seems to be fixed, 2 days later back again, but this time the fulid motor isnt stuck on. I dont think there are any loose wires, maybe a bad switch? Anyone experience this before? or got any recommendations? I still got the warranty, just hate taking it to stealerships. Thanks...