Hi and thanks for using 2CarPros.
If your brake light turns on with the lights, you have to have a short to power to that light. Have you carefully checked the wiring? Also, have you checked the grounds? A bad ground can cause power to back feed through other circuits to make contact and this is the type if thing that can happen.
With that in mind, first, inspect the pins in the connector to the light assembly to make sure noting is bent or damaged. Next, check the wiring as far as you can for cuts or damage to an insulator that can cause a short.
Last, I want you to check the grounds to and the main ground under the vehicle responsible for all rear lighting. I attached a picture of the ground and rear lighting. It indicates locations of the grounds. Check those.
Here are a few links 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
Let me know what you find or if you have other questions.
Take care,
Joe
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Sunday, March 17th, 2019 AT 8:04 PM