AC-3397, or possibly AC-3396 (manual system) that has been upgraded using pump/switch assm 1559268. Either is correct for the '63 Hawk. To connect it, remove yellow wire from wiper switch terminal 'D' and connect it to the yellow wire from the pump. Connect the yellow wire with black tracer coming from the pump to the 'D' terminal on the wiper switch. Remove blue wire from wiper switch 'A' and connect it to the male portion of the pump blue wire (piggy back) and then install that blue wire back on the wiper switch 'A' terminal. wain G> What it does (when you press the pedal) is turn the wipers OFF (once you've turned them ON at the switch). It does nothing (except spray the windshield) with the wiper switch OFF. It would probably work as a drizzle wiper, but maybe tiring on the left foot. The operation makes some sense electrically. It's not hooked in to the white wire with the black tracer at the switch which is the power wire...it's only hooked into the wires to the motor from the switch. All it can do is to interrupt the power to the motor (and I think it is also telling the motor not to park). The switch at the pedal is normally closed, but open when you depress the pedal. Pressing the pedal and holding it does give a continuous spray for several seconds. Dick Steinkemp The one on my Lark turned ON the wipers for about 5 or 6 swipes,with the wipers switch on the dash OFF. I think that is the way they were supposed to work.[wash the windshield without removing your hands from the wheel] LaSalle,Il 61Hawk