The slider inside the fridge has nothing to do with power to the plug box behind the fridge. Take the cover off the box and see if the wires are connected to the outlet and not corroded.
The sensor hanging loose would actually make the fridge/freezer colder than if it were on the fin. The fridge area not seeming cool enough could be a defective door seal.
2007 Surveyor SV230 - 200 Watts Solar/MPPT Controller - 230 AH Battery Bank - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting - Boon Docking 99% of the time.
2009 F150 - 5.4 Litre - 6 speed - Tow Package