looking for wiper switch info

As a matter of fact the 69 harness has the dk brown washer pump wire already in the wiper switch plug. If you use a 2 speed wiper switch, theres no spade on the switch for this function the wire is in the plug connected to nothing. The 3 speed and V speed switches plug in the same, and have an extra spade that lines up with the dk brown wire.

This brown wire goes to the firewall bulkhead connector. The corresponding outside bulkhead connector it goes right to the washer pump, then pump motor to washer tank mounting screw as a ground. If you have a V speed or 3 speed this wire is getting its switched power from the switch itself.