There is a separate earth for the fridge, and another one for the car +ve supply which powers the ATC. Did you fit both when you upgraded?
You should be able to trace the wiring back to the earth points and make sure the earth points are clean and secure.
Your earth points can be any suitable point on the vehicle chassis where you cab remove the paint under a screw or bolt.
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XC60 2013 D5 215 SE Lux Nav geartronic
Last edited by Whyman; Jun 6th, 2021 at 13:41.
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