Process of elimination. I had this very thing happen.
My problem ended up being both battery and converter bad.
First check the battery, disconnect the battery cables, then check for proper voltage or what is should be under no load. It may be necessary to to use a commercial battery tester to determine if your have a bad cell or cells.
Next, connect the rig to a shore power some place. It doesn't have to be a 30amp. A 15 or 20 amphouse plug will work provided you have a 30 to 15 amp adapter. Open the CB panel and find the converter output pin or screw, then find a good ground on the CB box.
If the converter is good, you'll get a 12 to 12.75 volt indication. If not you have a bad converter. You can save a bundle of $$$ if you'll replace the converter yourself. Even when replacing the unit yourself, there will be a big difference between suppliers as much as $150.00
In an emergency situation, you can get a 2/4/12 volt digital battery charger at Wally's for a reasonable price and hook it up to the battery in the battery compartment. This will keep you battery charged and usable until you can replace the converter.
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