Here is a prime example of where tinned marine wire may have bought this owner more time. A new run of 10/3 triplex wire was in order. The black oxidation on this wire can also create high resistance. When in doubt it is best to also replace the feed wire from the new AC inlet to the AC panel..


If your wire run between the AC shore inlet to the AC main breaker, at the AC panel, is more than 10' wire feet, not as the crow flies, then you will want to install a second 30A or 50A double pole breaker. This breaker needs to be interrupting WHITE/NEUTRAL & BLACK/HOT, and be located quite closely to the AC shore inlet.