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Are you sure you got the polarity correct and the cables hooked up correctly between them? Check that first and then if you find it was wrong, you may have popped the fuses on the converter. If you aren't sure, attach a photo of the cables to your post so I can see how you have them connected. All follow ups are included in our fee.
You might want to check the shortstop breaker near the batteries to be sure that didn't get tripped out. I am attaching a photo of one. The black button has to pushed in to reset it. By code these have to be within 18" of the batteries and the red positive cable(s) go right to them. Copper post and silver post. You may have more than one hooked up side by side. If you have a 12 VDC test light this is pretty easy to trouble shoot. About $5 or so at most hardware stores. https://tse1.mm.bing.net/th?&id=OIP.M60cddf5db924d363dd03f6ba05cd33d0o0&w=300&h=300&c=0&pid=1.9&rs=0&p=0&r=0
Just checking back in to see if that resolved this issue or do you still need some additional input from me here?