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What is the make and model of your fridge? Are all the other 12 VDC systems working?
How old are the house batteries and have they been serviced recently? Are you plugged into shore power or not?
On LP mode or AC mode on the fridge? What about the batteries?
I am attaching a copy of the Norcold Service Manual for this model. Print it out so you have it. Things to check that can cause poor cooling in the fridge are: Thermister going bad, low LP pressure (LP mode), cooling unit failing, or dirty door gaskets. If you have a small digital multimeter the thermistor can be checked. See that section of the manual. On the radio, many have a fuse near the radio that might be blown. That is usally caused by batteries that are low on voltage or failing. It can be from a charging system that isn't perfoming up to proper specs. A good converter should be putting out about 13.7 VDC to the batteries. That can be tested with the meter. If your batteries are over 3 years old or they haven't been serviced recently they may be failing or the cable may be dirty. Those are things to check. I can direct you in that and will make a phone chat offer for you in case you feel that would be more helpful. Please get back to me if you need more input from me as all follow ups are included in our fee. http://bryantrv.com/docs2/docs/ncoldnnewnseries.pdf
Just checking back in here to see if you got everything you needed on this or do you still need more input from me?