I didn¡¯t think about the ¡°jumper cables¡± route. (Maybe because I am a software guy, not hardware). I still need to make a cable with the right connector to go in to the powered ground board foot.
Too much unnecessary work removing the batt. A combination of jumper cables, gator clips, cig lighter plugs and wire will easily work to test and be a 12V backup power plan. Obsessions are made to be less complicated.?