If you have a 2011, 2012, or 2013 ACE, then you probably have a "RV Customs Products" Battery Control Center (BCC) FW-2050. If you do, you probably need to reset the "CB5" DC circuit breaker in your BCC located under your hood driver side. It is located in the lower left side of the circuit board. There is a small black button on the side of the grey Circuit breaker CB5. Push it in.
FYI This BCC was recalled, make sure the repair was performed on your BCC. Here is a link to a thread.
Thor Battery Control Center Failure Recall
06 Hurricane 34FT WH W20 Chassis 8.1L 129K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, KVH R5 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee