[OverBoardProject]

That puzzles me. I just looked at my 85 owners manual and I see that at least 3 circuits aren't working.

Although the parklights use the same bulb as the signal light it's 2 completely different circuits. Including different wires from front to back.

I would almost narrow it down to the fuse box, or possibly (and not very likely) the ignition switch.

It shouldn't be too hard to test the fuse box with a test light.
Don't waste any money on a used one until you test your present one. It sounds like you can't afford it.

Before you drive anywhere test your brake lights.

If you need a copy of the fuse box diagram from my owners manual sent to you drop me a private message with your e-mail address and I'll send it.
It doesn't show much or help much, but every little bit sometimes helps