Looking for some help. My issue is that when I go to switch my power panel from generator to shore power my main breaker for the shore power pops instantly. The polarity is correct and verified by the panel and the generator running or not doesn't effect this issue. Everything works perfectly with the generator running (lights, tv, AC, fridge, ect). I have 120 at all legs coming into the boat at the dock. I have 120 at each leg as it hits the EATON WMZS2C00 main breaker which I have replaced. I also have continuity through the breaker when on. I can reset the breaker and it holds but as soon as I go to the main board and engage the switch to shore power it blows that breaker. I have turned off every breaker I can find and it still trips the breaker? its a 99 Viking Princess 52 fly Bridge. Thanks in advance for any ideas or help.