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So I went through the rigmarole of tracing the electrical path of (I thought) the parking lights.
Unfortunately, the electrical diagram I had found online was not from an '84, and I was looking at the wrong fuse. I figured this out after testing contacts along the electrical path and seeing that everything appeared to have a continuous line. The smoking gun ended up being resistance; there were a few ohms between battery hot and the light sockets.
After consulting the Fuse diagram in Bentley's, I was able to see that I had been examining the wrong fuse for failure. After cleaning the contacts around the true fuse, the lights turned on again. Good grief! I'm just lucky that I didn't spend too much time banging my head against the car to try to evaluate the true cause of the issue. Now I just need to figure out why the trunk light still doesn't work! It's the only thing on that circuit that isn't functioning properly, even after replacing all bulbs and cleaning off the fuses.
Thanks a ton for the help! I've never experienced a circuit failing because of high resistance, but now I have that diagnostic method in my toolbox. This car is teaching me so many good lessons.
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