My 84 definitely has something screwed up with its electrical system. The left front turn signal doesn't work, nor does the horn, or the side markers, and the right brake light sometimes works and sometimes doesn't. None of the bulbs are burnt out and no fuses have blown. Any ideas of what could be the case?

Check your grounds. Sounds like it's ground issues.

Those junky little light bulb sockets go bad too. Make sure there are still contacts at the bottom.

+1 on bad sockets. You're in Michigan, land of rusted cars.

Turn on the signal and measure at the socket with a sharp test light probe.

start here... See my Cave, Sneak Path

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

Thanks so much! I'll see what I can do this weekend and I'll get back to post the results