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On a used Miata I bought in the past, I had the same behavior. Consistent dark current jump to 1A or so every 10 seconds which caused the battery to die after ~a week.
Took me awhile to find it but turns out there was some gimmick device installed meant to pulse the body of the car with 'negative ions' to keep rust from forming. I found the device on the inside of the firewall, with two electrodes touching the bare inner fender. About 5 seconds later, my dark current drain was gone.
I forgot the name of the manufacture but once I looked it up, they had many lawsuits against them for false advertisement and had since gone out of business.
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