We have a 2013 ACE 30.1 and had the same problem. The red battery light would come on and the go off randomly. Sometimes it would come on immediately when the engine started and other times it would come on while driving - but, there wasn't a consistent pattern.
This went on for a couple of months and then one morning the engine just shut off while it was idling before a trip. Got it towed and it turned out we had a bad solenoid.
Just to be safe, I take it to a Ford truck center or a good RV repair shop and have them run a computer diagnostic before taking it on a long trip.
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