I would look under the fridge or oven for a box that has a drop down door where all of the 120VAC circuit breakers and 12VDC fuses are located. The converter/chargaer is usually in the bottom compartment of this housing...
Find the part number on this unit and let us know what it is...
This is what my WFCO 8900 series power distribution panel looks like
Your 2002 model may only have a very simple unit that looks like this...
On this 2013 ROO you can see the converter/charger unit installed under the fridge next to the floor