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Hi my name is Robert.....
I would say it would be fine to use the existing red and black, it should have a 3 amp fuse in the circuit so you will know right away if the fuse blows, if the fuse blows then I would run a dedicated power and ground with a switch so you can turn it on and off as needed. My only other suggestion would be to unplug the thermistor from the P-2 connector and see if the fridge defaults to full cooling, if the fridge gets very cold you might have a thermistor issue. If the fans are only drawing 0.2 amps it should not be an issue... Hope this helps some, IF you have more questions or concerns please feel free to contact me... Robert
Hi... I see you have not selected a rating, if you need more help please let me know.... Robert