Taillights not working

Just to confirm you checked fuse 20 which is a 10-amp fuse on the left side of the dash fuse block?

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If so, and that is not the issue then can you confirm the third brake light is working or not?

If it is not, then the likely issue is the stop lamp switch. This is going to be located on the arm of the brake pedal and you will see if it has two wires. I would remove the connector and jump the terminals together. Do the lights come on?

If so, then the switch has failed.

I am attaching the wiring diagram and the testing from the manual. They have you check the resistance which is another way to test the switch itself.

Please run through this material and let us know what you find with it.

Thanks