Hi FHayden,
Sounds like you reversed the polarity of the batteries when you hooked them up. Trailer ground should be connected to the negative terminal of both batteries and the positive battery terminals should be connected to the Red cable going into the trailer. Once you switch the wires around your 12V converter should work ok, they are suppose to be reverse polarity protected, however you may have tripped a breaker or blown a fuse in the converter.
Hope this helps,
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Steve, Margo & April the campy Cocker
SOB Motorhome
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