Don't have a picture of the relay panel handy, but for the high speed fan, have you checked at the fanswitch? It's at the bottom of the radiator. Pull the plug and you'll find 3 pins. One is live fulltime, one is for low speed, and one high. Shunt the pins and see if you can get the low and high to come on that way. Obviously, if you connect the high and low, nothing will happen. If the high trips on, you have a faulty fanswitch.
Actually, now that I think of it, my wiring has been tampered with in the past as well. There's no fuse for the ac fan trigger IIRC (fuse site is completely melted). Yet the AC triggers the high speed. Have been too scared to look into it since everything seems to be "working"
edit: lmao hvac high speed fan not radiator