Agreed with everything posted. I guess my concern is, this is not normally an end user maintenance item or servicable part. And this is a newer refir, with no visible corrosion.
At home, do you pull your appliances, open up the power cord electric box, and check the wire nuts for corrosion?
Even though it's a house boat, it's arizona and it's bone dry. There is little to no corrosion. There is more corrosion at my house 2 miles from the ocean. You would think the connection would be properly coated with dielectric grease or similar from the factory, especially since it will be mounted with the exterior exposed to the outside (in a vented compartment in the rv.)
Scary stuff, bad connections lurking everywhere, how am I going to sleep tonight... :)