The USB port on the radio is for input to the radio. You can use it to update the firmware of the unit or play tunes from a stick. The USB port on the dash is for charging devices. On my coach the dash USB has nothing to do with the radio. It is only a power outlet. Knowing Thor, they probably wired something wrong.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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