I had just recently bought a 91 formula and I am having serious issues with the accessories in the car. I am trying to figure out if each of these accessories are old and just need to be replaced or its a bigger issue with the car itself. The car cranks and drives great but,

Dim headlights, dead radio, cigarette light doesn't work, wipers and power windows work very poorly.

 

Sounds like a bad connection somewhere in The Big Red Wires that go from the fusible links at the starter, through C100, and into the pass cabin.

C100 is the big connector with several dozen wires in it, including 2 Big Red Ones, below the power brake booster. Start there. Look at both sides of it and see if any Big Red Wires look like they've been overheated where they meet the firewall.