Penzfan, I was talking to a couple other techs about your problem. All of us came to the same conclusion. It did what! :-)
I do have a strange test. Try pulling the CHMSL fuse out of the lower fuse panel and see if your cruise returns. That is the circuit that feeds the trailer brake lights and tells the PCM to shut off the cruise control. Perhaps some corrosion or something could be causing enough current flow to shut the cruise off (just like stepping on the brake).
With the the light converter and the trailer that may have created enough of a load to stop that current flow and the cruise turned back on.
Monday, January 2nd, 2017 AT 10:06 AM