Are you sure picture 4 is the stop light switch? It doesn't look like what I expect it to.
You didn't say, but given A/C, the under hood and trunk lights, and automatic transmission I assume the car has turn signals. The fuse blowing with the brake light switch disconnected says the problem is not down that path.
When you say "the trunk light still comes on (???) when the parking lights are on" does the trunk light stay on when the headlights are on?
Try pulling fuses one at a time and checking for operation of the trunk light to see where it gets its power.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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