Sammie, you may want to refer to schematic Chassis Wire 04 p36gwire 146050 page 02. This shows a pretty clear drawing. Also there is an inline fuse; on my 2004, 36g it is located at the upper right of the three house batteries. This fuse is shown on page 02 also.
The messages displayed or not displayed at the Dimensions message panel should provide a clue. You may need to call Dimesnions 651-653-7000.
If the batteries are charged it will be easier to trouble shoot the Inverter. This will help identify if you have an inverter, charger or both problem. I recently purchased a seperate charger to charge my house batteries to help me trouble shoot my inverter. I now use it sometimes to charge the engine batteries.
I suspect you have an inverter / charger problem which now may have created a battery problem.
I know this is not too specific but hope it will get you started.