Thanks fot the responses guys, I'll try the suggestions. Could it be the self-park switch? Does anyone know where this is? Is it incorporated into the wiper motor?

I have a 300 series Discovery. When I turn the front screen wipers off, they take between 10 seconds and ten minutes to stop. This can be very anoying when its not raining? Doesn't matter if I use the quick wipe, intermittent or continuous, fast or slow, same problem. I've tried changing the...