Looking to upgrade 69 Dart wiring

The painless harnesses also only give power in feeds to things like your heater blower, and wipers. So for instance your windshield wipers, all you get is a fused single hot lead. You have to figure out the output side of the wiper switch to the wiper motor. Ditto for the heater control. You get 1 fused hot wire as power in, and you have to figure out the output side of the switch to the blower motor and resistor