Just purchased a 2008 62' Neptunus with 2 50 amp cords, (these cords seem thin to me for 50 amp). Manual says I should be able to run a light load off of one 50 amp cord and that the other 50 amp is for additional ac. I can run everything except the ac on the one 50 amp cord, if I try to run just one zone of ac, with nothing else on, it trips the breaker in the engine room. I have had trouble with shore power at half of the marinas I have been to, trying to get the 2 50 amp cords to work. The genset runs the entire boat fine. I have a feeling someone changed the configuration from the factory.