When mine first failed (like your symptoms), I had to replace the top fuse. A couple of weeks later, the fuse blew again. I replaced it with a self-resetting fuse from NAPA for $7. This worked for a while but by now the converter was only putting out about 10.8 volts. I used a small battery charger to finish the trip with it supplying 12+ volts through the battery.
It seems the internal voltage regulator in the converter failed and I eventually replaced the converter, now everything is back to normal.
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