Fusible links

Hello, the Fusible Links are pretty easy to find, they are going to be near the battery or near the Starter Solenoid. They will be in series on the main red wire power feeds. They are a much wider gauge looking section of the wire. usually a few inches of the wire. I'll put the wiring diagram and a picture of some fusible links. The picture is from a 1994 GM. In the wiring diagram it looks like the Fusible Link circled in green is the Link that powers all the components you have not working. Unfortunately, there are a lot of them on your vehicle. In this case to test which one is not working I would pierce the wire with a very small hole and test the wire for power with a multimeter or test light. Or considering the vehicles' age, just replace them all. They can be crimped onto the wire and use a heat shrink connector to keep moisture out. You can get everything you need at a local parts store. It's not too bad to replace these. Just be careful about shorting any of them out. Probably unhook your negative battery cable to be safe.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-a-car-fuse