All of the items you have listed as working are 120 volt AC devices. They only work if you are on shore power or generator power.
The items that are not working are 12 volt
DC powered. Which means they are powered by the battery or the converter.
Since it appears that none of the 12 volt
equipment is working. You are obviously not getting battery or converter power.
Have you checked for voltage at the 12 volt
Have you tried a battery charger?
How did you check the fuses?
Are the larger fuses tight in the holders?
Have you tried replacing the larger fuses with new fuses? Making sure they make good contact in the holders.
Can you post pics of the fuse panel? We could tell you where to place the meter leads to check for voltage.
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