You need to removed the boot inner panel pop out the plastic clips with a screew driver (smaller part of the clip first) then der is 2 10mm nuts holding it up from the inside
the third brake light is direct from brake light switch no fuse
Begin by removing the wiring harness from your third brake light. Remove the third brake light retaining screws. Reverse the process to install your new third brake light.
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The third brake light is named for then Secretary of Transportation Elizabeth Dole and are called "dole lights".
Chevelles never had a third brake light since the Chevelle name was dropped after 1977. However, third brake lights were first installed (and required) in 1986.
with a hammer
A third brake light is used to provide a deceleration warning to vehicles that can't see the left and right lights. You can learn more about these brake lights at the Wikipedia.
New bulb needed or broken wire
1985
There are a few reasons that the third brake light is the only one working. One reason could be that there is a short in the wires of your main brake light. Another reason is that the light bulb has blown out.