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Did you just hook up the battery(s) before you left? It sounds like you have the polarity wrong OR the converter just shorted out. One or the other here would seem to be the problem based on what you told me. OR another place is shorted out and caused you to lose power and the short was setting off the alarm. Get back to me with some more information and we can sort this out.
Just checking back in to see if you were able to get this resolved or do you still need additional input from me here?