I have a kenmore top freezer fridge. The plug on the wiring harness that the heater plugs in to is burned up. The heater has continuity, and the thermostat is working based on continuity test and I could hear it click as it warmed up. We have had a problem with the ice maker dripping water at the back of the freezer and causing an icing problem so I'm wondering if it shorted out the plug. What other causes could there be for the connection to heat up?