I am having a real problem with the black wire in the top control box (box with 2 screws outside of it, and red button you push to turn on) The black wire continuously (like 4 times the other day during a job), wiggles off the lead it is clipped to. I put it back on and push it in as much as possible each time. Nevertheless - wiggles off, I need to stop, open the box, etc. Who knows an e-z fix for this. I have to believe a lot of people have run into this.

Hasn't happened to me. When I'm experiencing little tech glitches, I e-mail Lee Watson at Challenger. He will respond very quickly with helpful assistance.
contact@challengerop.com.

I emailed him also. He already has responded, and what he suggested I think will fix it in about 5 minutes. Thank you! Just so you know, for "hands on" stuff with working the machine, I think he views you as possibly knowing more then him. (would make sense - you use it daily).