There are two things that come to mind.. possibly 3 but let me re-read 2002 limits it to 2.
First; There is a device called a battery disconnect, these come in several flavors but most involve a solenoid type device (Basically a big relay) located somewhere in between the battery and the house, It is possible that it is in the OFF/Disconnected/Store position.. Check your disconnect.. See note below.
Second, it is also possibly you have multiple connections usually to the battery positive.. I have modified my system so I have only one but many motor homes have 2, 3 or 4 such connections.
We have had many posters who missed a cable when they re-connected, or even who hooked a cable to the wrong post.
The third thing is a specific type of converter but I do not belive you'd have one of those in a 2002. (Magnetek)
Home is where I park it!