Since it works when it's cooler, something has to be expanding and causing a loss of connection. When it doesn't work, does the horn work?
I attached the entire wiring schematic for the cruise control. I had to cut it into two parts to make it readable, but I did overlap so you can follow from one to the next.
The one thing that I'm questioning is the clock spring in the steering column. When it doesn't work, is there any indication that it is powered up but failing to operate?
Let me know.
See pics below.
Images (Click to enlarge)
Wednesday, May 26th, 2021 AT 6:33 PM