When I got my car, I went through a process to clean and grease every wiring connection, and pulled everything from the right side of engine to clean, paint and replace all rubber (all the FI stuff is there to). Part of that process was to pull the wiper motor, shaft, etc. out of the car, clean and regrease as required. I didn't go as far as taking the motor apart as I didn't know if it could be done but everything out side of that was done. I used dielectric grease for any connection and a clear synthetic grease for any moving part including the toothed shaft and the wheel boxes. At the bell crank end of the shaft there is a copper tang that operates a switch as it moves back and forth. This switch determines the parking of the wipers. The switch is adjustable, there is a mounting screw when loosened allows you to move the position of the switch block to move one way or the other. It doesn't determine the parking position of the wipers but determines whether they park or not. The tiniest adjustment can determine whether they park or not. It's trial and error. The switch position can be adjusted with everything in the car, I think you just have to temporarily remove the motor mount bracket and cover to get at it. The wiper have been reliable over the last 11 years be it single swipe for mist or full speed ahead for torrential downpour. I never tried it on dry windscreen as I don't want to drag anything across the windscreen for fear of scratching it. Cleaning and dielectric greasing the electrical contacts in the circuit ensures it's getting the full 12V to the motor. Long story short, make sure it's getting the juice it should, minimize any friction, correctly adjust the park switch and they will work fine for a long time.
- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT