There is one thing to do -- replace the cord. You are dealing with a 50 amp 120VAC circuit exposed to the weather in use. Get a new, molded cord from an parts supply and use it to replace your old cord. If you use an extension cord with the coupling out in the weather, seal it with tape and prop it off the ground.
A general caution: The prongs of a shore power cord can get oxidized by plugging it into a live circuit. RV 120VAC circuits are always under load -- from the battery charger if nothing else. When you plug in the cord to a live circuit, the load will cause arcing and oxidize the prongs. Every campground I have been in has a circuit breaker controlling the outlets at the site box. Trip the breaker off before you plug and when you unplug.
Phil
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1983 Newell Coach
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