Hello, I'm Danny.
It sounds like you might have an open in a wire in the cruise control circuit. Here is a tutorial showing how to test wiring:
I've attached pictures below of the cruise control wiring diagram for your truck. I've cut the pictures into 3 pieces so you can view larger. Hope this helps and thanks for using 2CarPros.
Images (Click to enlarge)
Thursday, February 4th, 2021 AT 6:47 PM