Hi and thanks for using 2CarPros.
First, make sure there is power both to the switch and out of the switch when you depress the brake pedal. If there is, I need you to check ground. I attached a schematic of the brake lights. Note that both sides have the same ground. However, the third brake light has a different one. If the third brake light works and the tail lights don't, I suspect the ground.
Here are a few links that you may find helpful:
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-check-wiring
Also, check for power in the fuse box.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Take a look at this and let me know about the ground. Additionally, you mentioned that the signals are not flashing fast. Do the rear ones work?
Let me know.
Joe
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Saturday, January 5th, 2019 AT 11:53 PM