Electrical mystery Windsport 27B
Having some electrical issues after a few days of traveling on Iowa rough roads. Chassis battery shows .1v on firefly screen and phone app. Off course Jack's, windshield screen won't work. Check battery voltage 13.5 is good and engine will start. Look under hood for any loose wires, nothing obvious. Look again at phone app and now shows 13.7 volts. Start engine, Jack's work,screen works. Any ideas where I should check for loose wire? Currently at campground so any help would be appreciated.