I am at the end of my tether,i cannot mount my wiper spindles on my truck until i have established the position of neutral for the arms,and to do this i need to power up the wiper on the bench.The wiper motor is the lucas twin-speed with park,it has three wires visible on the outside,on the plastic plug it has 5 male contacts,one at 12 oclock horizontal,the rest 8,11,2 and 5 oclock vertical,can anybody help ?? john.