I am going to make a hybrid 1968 BB/1973 long hood. So, things are a little easier, no wiper door. But I admit I struggled with understanding what I needed to do to get the 69 wiring harness to just operate the motor! I put this schematic together from a 69 schematic and a 74 schematic. Tried it and it resulted in the ultimate electrical fail (melted wires). In my defense, I was working with a defective switch and didn't know it.
So, my second run at this involved completely re-thinking what I really wanted the wipers to do. The 69 wiper has a pump to squirt wiper fluid when yo push the switch button in. I don't see myself driving through a mud bog in this car so, I don't need that. I also don't see myself driving in a monsoon so I can do without the high speed wipers. I would like to push a button and have the wipers swipe the window once or twice. I think that's useful. Lastly, I wanted to replace that awful switch!
So, the next step was to "hotwire" the wiper motor and see if I could make it do what I want. It took five minutes:twitch: This is after spending a couple of weeks screwing around with this.
It's so simple you don't need a schematic. There is a three wire connector that goes to the wiper motor. The middle one is the switched power. The bottom is grounded. To turn the motor on to low speed the top wire is grounded. To park the motor and tun it off, you switch off the ground (to the top terminal).
I think the wiper door electrical/vacuum interface to these cars is really over complicated. I had the same issue with the headlight door and motors on mine. I had two choices. Turn the motors and headlights on at the same time or open the doors and have a switch on the doors that turn the lights on when fully open. I think you could do something like that with the wiper door. So the open door would actually trigger the wipers.