I've had to replace the male plugs on two of my MHs. I replaced the last one, dissected it to ascertain the problem, and determined that it had a bad crimp on the main power wire. Like mentioned above, the problem can also be overused/burnt campground connectors that are worn out. I replaced my plug with this one. http://www.amazon.com/Voltec-16-00-5...ilpage_o01_s00
Just be aware that you have to crimp the correct lug onto the wires. You can't just wrap the wire around the screw and tighten it down. So that would be a lug that fits a #10 wire and it's either a #8 or #10 screw. This connector is just about as small as they get and should fit into your hole.