Just bought my new truck today. According to the manual , the USB port in the center console that has a picture of a battery should charge when the car is off. It does not. I have tried several cables and several devices. All charge when the car is on, and stay charging for a few minutes once the car is off but eventually stop charging. I tried the other USB port in the back seat that has a picture of a battery and that charged any of the devices with any of the cables when the car is off or on. I need to leave a pair of wireless headphones in the center console and would like them to be continuously charging. From what I understand, this should be possible but it is not happening. Am I missing something or could it be something broken/wrong.