Thanks to all who made suggestions. I didn't solve the problem in time for our outing, but we were able to change to a site with shore power. Turns out the problem was a bad + wire from the battery to the converter, and I concluded that by running a temporary wire between the two as suggested. I wasted a lot of time before I did that simple test. Because I couldn't determine where the break was, I ran a permanent replacement wire along the same route and also relaced the old connecters with waterproof butt splice ones. Rookie mistakes are testing DC circuits with shore power connected, and not having the DC power on at the battery.?
