Ok new friends. I changed the 2 burnt fuses and towed the trailer home from the lake. About an hour at highway speeds plus more than half hour side roads. No charge to the batteries.
Is there yet another fuse or breaker somewhere? Before I crawl back in there and break something more expensive than a $1.50 fuse, there was a largish black plug I had to pull out of the side of the converter to get at the fuses. Could that be an inline fuse? Could there be a breaker reset on the converter somewhere?
Stumped and powerless.
George