Another Zamp solar plug question

[1Longbow]

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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[CA_Traveler]

Most likely reversed polarity, check with a voltmeter per prior post.

[Bobbo]

Get a volt/ohm meter (multimeter) and check to see if the Zamp is connected to the battery. Then check the polarity of the Zamp connector. Then check the polarity of the power from the solar panels. A mismatch in any of those may be your problem.

[Lwiddis]

Ah, the problems of mixing solar company components, proprietary plugs designed to discourage you…etc.