Been looking everywhere for an answer to this and cant seem to find one anywhere but i have a 91 camaro z28 on the passenger side firewall theres 3 loose connectors. One is a 20amp fuse holder the others im still trying to figure out, if someone on here could help me out and lmk what these are for it would be very much appreciated!

 

The fuse holder can be a number of things, factory or aftermarket. If it's factory or wired properly, then the red will be unfused battery 12v constant and orange fused battery 12v. A meter will confirm
I'd bet the fuse is protecting the fuel pump relay, again, meter

The black 4 pin connector next to it is the engine bay harness to HVAC mini-harness
The three wires are:
Red 12v batt to the blower fan relay
Blk blower fan grd
Lt blu AC request

Blk/pl and blk/orn are the original dual electric fan power wires. For GM fans, these go to the B terminal. A is direct ground