Steve, try this: First, turn off all 12 volt items, including the refrigerator. Now unplug the converter and remove the heavy red charge wire from it. If needed, tape up the exposed copper wire to prevent it from touching anything metallic. Now reset your breaker and plug the converter back in. If the breaker trips, you definitely have a converter issue. If it doesn't, try touching the red wire to the terminal you disconnected it from. If the breaker pops, it means the converter is drawing too much current because the load on the red wire is too great. The cause for this could be from a short in the red wire. Use an ohm meter or continuity tester to see if the wire is shorted to ground somewhere. If it is, you either need to replace the wire, or find the short and fix it by repairing the wire. A bad battery or extremely discharged battery could also cause this. Just because a battery is new doesn't mean it's good, but I'm leaning towards a short in the red wire.
Whatever you find out, please post the results so it can help out anyone else with a similar problem!
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