Good evening,
I attached a wiring diagram for you to view.
Please verify the white/tan wire off the brake light switch has power with the pedal depressed.
https://www.2carpros.com/articles/how-to-check-wiring
If it does and the 3rd light works, there may be an issue at the splice I circled where the wires to the rear lights come from.
Roy
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Thursday, September 17th, 2020 AT 4:25 PM