I'm the kind of guy that never gives up until I solve a problem.
I went over every wire off the battery, main disconnect switch and junction box again. No joy there.
Went back to the power panel and checked all the wires again and then finally noticed that there was a second wire attached to the positive post on the panel. My feeble brain was thinking of this as input, not output. Followed that wire and discovered two 12v breakers located behind one of the kitchen drawers. One for the slide, 1 for the awning.
quod erat demonstrandum