No reverse lights

Hello, I'm Danny.

First, I'm attaching a tutorial showing how to test your trucks wiring.

https://www.2carpros.com/articles/how-to-check-wiring

Also, I've attached below a picture of your trucks reverse light circuit.Hope this helps and thanks for using 2CarPros.
Danny-

All the wiring looks fine the bulbs are good. Where else should I be looking? Is there a sensor somewhere else like on transmission?

If I can jump in here. it sounds like the TIPM is out. To be sure use this wiring diagram to check for power with the guide on how to use a test light. It easy to replace the TIPM because it self initializes. Here are diagrams and instructions on how to replace the TIPM below.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.