Interesting thread! I have a 72 GTV. The foot pedal worked fine before I unhooked it and did my interior over. Now, when I plug the harness into the pedal the wipers run continuously. Any idea why?
John - I'm playing with my wiper wiring right now and noticed that its possible to plug the harness into the foot pump backwards. At least it is on my car - I can't recall if I replaced the molex connector or if its factory. Anyway give that a look.
I would suspect that wiring has been reconnected incorrectly. As I recall there are 4 pins on the pump linked to 2 pairs of contacts. With the switch released, one pair of contacts is closed (park circuit), and the other open (high speed running).
When you press the washer, the contacts for the park circuit open and the contacts for high speed running close - meaning the wipers operate continuously at high speed.
If your wires are held in a proper plug, then perhaps the plug has been reconnected incorrectly (plug rotated by 180 degrees)
If your wires are connected via loose spade connectors (like mine) then perhaps they have been reconnected incorrectly
The contacts 31 & 31b are for the park circuit. The contacts 54 & 54a are for the high speed circuit
For those in the UK, I got this diode from Car Builder Solutions and used it in the circuit to trigger the washer motor when I press the foot pump. The washer motor that I used is the one incorporated in the bag (WI007) Silicon Diode