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You don't want to try running anything without the house batteries. I would go ahead and get the new ones and install them. I hope you took a photo of the cables. Easy to get this wrong if you don't or make a good diagram. I like HD Interstate batteries and sell them in my shop. If these are 12 vDC batteries they are hooked up in parallel which is positive of the one to the positive of the other. Likewise on the negatives. If you have 6 VDC batteries they are hooked up in series connection which is the negative of one to the positive of the other so you have one 12 VDC "unit" consisting of two batteries. Positive cables get hooked up first and then the negative cable(s) last. Then hit the battery disconnect switch in the cabin and see if power is restored. Don't have the shore cord plugged in when you do this. Check the breakers in your load center after you plug in again to be sure none are tripped. Flip them off and then back on again. While you are out getting the batteries stop at a hardware store and get a small digital multimeter if you don't already have one. About $20 and easy to use. Very helpful for tracking down electrical problems on these units. I can direct you in some testing. Get back to me if you need more on this as all follow ups are included in our fee. No time limit.
Just following up here on your question. I am wondering if you perhaps missed my earlier response or did you get this resolved? Easy to do with the large amount of e-mail most of us get these days! If you need me to resend it, please let me know. Thanks