Keep in mind that this gear is designed to work on 12v battery systems and not 12v. You will find the camera specs allow a much higher voltage and that 12v is at the low end of the range. If any voltage drop in the cables, then the camera might be at too low a voltage. Try 13.5v and measure voltage at the camera.
Perhaps build a very short. Say 100mm cable with a socket at one end and a plug at the other. Scrape some insulation off the wires along the 100mm section but not opposite each other and attach some multimeter probes.
Measure the voltage when cooler is at max current.
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