I had a similar problem but never figured it out.
I bought 1 for my ZT and 1 for my wife’s qashqai at the same time. Mine suffered the issue of constantly blowing fuses after around 8 months. I tried a mix of my camera and wife’s power lead, her camera and my lead, my car, her car etc. Any combination blew the fuse in my car but same combo worked fine in her car.
They were cheap again so I bought a 3rd and it worked fine out of the box, but never got round to fitting it properly and it remains in the box still.
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