I was told by our tech during the walk thru that when under way, make sure you have the switch for the house batteries turned on or else they will not charge from the alternator. I know Steve has the same unit we have, a 2016 3171DS. Good luck Steve and let us know what you find out. We still haven't brought ours home since we bought it. Still in the shop for the passenger slide motor problem.
1968 tent trailer
1985 Jamboree 23 ft
1997 Minnie Winnie 25 Ft
2016 Forester 3171DS (ordered March & arrived June 2015)