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Something is either wired up wrong OR you have a short in some of the connections. Start by getting the 12 VDC system working properly. That takes at least one good Deep Cycle 12 VDC battery AND a good converter. That means you can test yours when hooked up to 120 VAC on the shore cord and see if it is putting out at least 13.4 VDC to the battery. I would look for a wiring issue where the tow cord hooks up to the unit OR a problem in the plug on that cord. Those would be the most likely places to find a wiring short or error. Let me know when you respond if this has a standard 7 way cord and plug or something else and we can sort that out as well. All follow ups are included in our fee. I will make a phone chat offer for you as well as some customers prefer this.
I am in California so not a problem............
Just checking back in to see if you got this resolved or do you still need some additional input from me here?