For the wiper problem ( temp fix) just open the hood and disconnect it from the wiper motor, then if its raining just reconnect it. It sounds like you have multiple wiring problems, if it was me i would be using a test light and probe some wires looking for shorts, start with the brake light that wont light up and trace the wires back, there could be a broken wire along the way. Sometimes when there wired for a trailer plugin the wires come loose or break where its wired into the rear wiring harness of the Vehicle.
The most likely the problem for your windows is the Master control switch on the drivers door ( controls all the windows, Anti child locks rear windows/doors) or again another short/broken wire, do the switches on each door work or are they dead to? Power steering is either Belt is to loose/missing?, low fluid, or bad PS pump, as for your AC just use the 255 type AC, Open 2 windows at 55mph