Uberschaf,
You are probably right, however, that rating allows for the normal voltages seen in an automotive application, 12 VDC at rest, 13.8 VDC charging, and occasionally higher if something goes wrong. Connecting the radio to 16 VDC at rest, with subject the radio to approximately 18 VDC during charging, and since this is part of the motor circuit, it could be subjected to transients from the motor drive electronics.
IMHO I would install a DC-DC converter.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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