Check the switch. It has a different one than the regular brake lights. the light bulb could possibly be blown
There could be a separate fuse for the lower brake lights , or maybe both lower brake light bulbs are burned out
depending on the vehicle - some have a separate fuse for the third brake light
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.
I have the same problem - but my third brake light slightly flashes when the car is of (Explorer 1998). I have replaced the "stop light" switch with no improvement at all.
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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.
you have to pull the feed wire off the brake switch to supply power to the new third brake light. get a test light and test the wires on the brake switch....one is hot all the time the other one gets hot when you depress the pedal....that is the one you need. do not take it pull your power from the rear light it might have an intergrated turn signal wire. which would make your 3rd brake light blink.. ok.have fun! you have to pull the feed wire off the brake switch to supply power to the new third brake light. get a test light and test the wires on the brake switch....one is hot all the time the other one gets hot when you depress the pedal....that is the one you need. do not take it pull your power from the rear light it might have an intergrated turn signal wire. which would make your 3rd brake light blink.. ok.have fun!
with a hammer