Sounds like the problem is somewhere between the battery and the main power distribution panel. A couple of suspect connections would be at the auto reset circuit breaker. There may be two of these depending on the TT model. Another possibility would be the battery disconnect switch (if equipped). Look for any irregularities or degradation and do a "tug test" on all connections and connectors.
Good luck and let us know what you find.
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2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
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