So the PO had used house wiring and bypassed the blower speed switch to a single on/off. I didn't note the colors, when I removed it, but I know that Black/Gray is my hot wire. Does anyone know how they plug into the back of the speed switch and which color is which speed? I've tried finding a harness for it but have been unable to on google, but I also might not be hitting the right keywords.

Wire Colors:
Black - Hot
Red - Max
Green - Medium
Light Green - Low

 

There is a wiring diagram at the top of the Gen 1 section, that'll help you. Colors should be the same.

 

Don't forget to replace the blower resistor. That's why these hatchet jobs usually get done. The resistor goes out and someone just wires it straight.

 

Since I've got the wires stripped, just tested them today (probably could've just done that to start with, but they all worked) and updated the main post just in case someone else needs it

I'd read about that and it slipped my mind, a friend ordered the harness that plugs into the back of the switch, so once that arrives, we'll know whether or not I need to replace the switch and the resistor.