Another Zamp solar plug question

I bought a Renogy 200w suitcase solar panel. It works great when I use the battery clamps. To make it easier to connect ,I bought a Lamp solar plug and installed it. I know the polarity is reversed on them and have the adapter . I also bought the new connector to change it to SAE. I hooked the positive (red) wire to the positive terminal of one battery, with a 20 amp inline fuse and the black wire to the negative terminal of the 2nd battery. (2 12 volt batteries in parallel).
Now I get a flashing error code b01 ,which mean not connect to the battery ,when I plug into the the solar plug. What the heck am I over looking. Thank you for any help
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