I had a similar situation except the black (ground) wire broke off. Some people claim that they can push out the slide. I was not able to do that. I had to take a crowbar to the motor and actually break the set screw.
It was a bear of a job. I couldn't find anyone who could get me into their service center for 2-3 months so I did it myself.
2017 Tiffin Allegro RED 33AA, 2015 Jeep Wrangler, Barney (Chihuahua), CJ (Beagle)
2016 Airstream Interstate Grand Tour (sold)
2012 Entegra Anthem RBQ (sold)