Groover wrote:
Bottom line is that someone is going to have to make sure that all of the lines in the camper are getting both power supplied and a good ground connection to the Edge.
You are going to have to get a voltmeter and check voltage
Yes, this is the basics. Start there.
Another thing to consider is to check some Ford forums and ask if anyone has seen something similar. I don't know Fords, but I can tell you that on many GM trucks a bad flasher unit will behave like a bad ground. I went crazy one time just before a trip trying to find a similar problem to yours, even replaced the factory 7 pin connector. Only to find out that it was a bad flasher unit. Maybe Ford has a similar issue?