Just to add.....very early standard Escorts [ non RS ] had a different motor [ non Delay wiper feature ] All RS models do have......please note the Wiper Delay relay on RS Turbo serious 1 / & 2s is wired in line with the self Parking system, so a fault on the relay will cause your problem as well, relay must be in place in the relay Box to complete the circuit. to sum up "slip rings" in motor due to wear......Delay relay fault... will effect the Parking side....but not the 2 speeds of motors..sorry should have added that above [ age again ! ]......Peter