Hesitating wipers

Hi,

I've been having hesitating wipers. They just stop where they are when you put it in to fast mode, waits two seconds and then kicks off. Sometimes they also stop when in slow mode.

Any ideas? Motor or electrics?
 
More than likely the motor/mechanism. This is taken from the forum Buyers' Guide:

The wiper mechanisms can be problematic, especially on older cars. Check that the wipers operate freely and through the full sweep. Also check that they will operate on the higher speed – the greater drag of a sticking mechanism will stop the wipers from operating quickly.