Cruise control not working?

Yep, you called it, the clock spring or spiral wire behind the steering wheel is a weak link. But I would check to make sure the brake lights are not on without your foot on the brake pedal. Did you try rockauto? Here is how to change the clock spring out in case you need it.

What's the purpose of this Clock Spring?

It enables the connection from the steering wheel control to be able to command the cruise control. Please check out the wiring diagrams which I have marked the clock spring. Check out the images (below). Let us know if you need anything else.