Also I believe there is a switch that senses when the wiper finishes the cycle to turn it off at that point. If that was broken then I suppose it would just keep running. I think this is usually mounted on the motor. I don't have specific experience with that however. I have noted a lot of problems mentioned on this forum with the wiper combo relay. Might try doing a search.

MP

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra