RV Electric - I am obviously a novice

ThomasFour wrote:
Tenbear, yes I did employ your suggestion. The ground wire fails when I apply appropriate power to lift the bed. So, somewhere there is a problem with the ground wire. No idea how to identify where. I could just bypass the ground wire near the bed lift and that would probably result in problem solved.

Not sure what "ground wire fails" means. Does the voltage on the ground wire go to the +12v voltage? That would indicate a high resistance in the ground, probably a poor connection. If you can find another good ground wire you could tap into that, or run a new wire from a convenient chassis location.