From past experience I have found the rubber weatherproof connection gets REAL hard with age and then the wire loses it's contact with the stud. But yes, the ground may also be bad so both need to be checked out.
And while he's back there now would be a great time to put a common 2" X 4" inline filter in the 12" hose. All three of my C3's have a filter back there as it's such a dandy place to put one.
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