Dual 1977s

[Turboba6]

Morning Folks, I recently purchased 2 1977 devilles, One Sedan De Ville 62,000orig mi and a Coupe DeVille 50,276orig miles.  I Also purchased a Factory Servive manual of course.  Several Questions:

1 . The Coupe has NO Taillights or Front Parking lights, Fuse is Good...Where to look first??
2.  They Both have Interior dash light problems, by playing with the switch I was able to get the Sedans working, but the Coupe had NO Interior dash lights, fuse good is there a Replacement for the dash mounted switch??
3.  They Both Need antennas, I see there some NOS ones (Expensive) floating around, by this time arent the Plastic cables in the NOS ones Bad/Brittlr from sitting on shelves for 44 years??

I'll post pics later, these are Both Mint Garage Queens!!

[Big Fins]

I would be starting at the headlight control switch first on both cars. That feeds the various circuits that you are having trouble with. May be as simple as a connection.