Just got our lighted nameplate/plaque for the outside of our unit from Heartland today. Looks great! I plugged it into the USB port and nothing happened. I turned every switch on that I know of on the unit, but got nothing from the sign. Is there a switch somewhere to turn the lighted nameplate on? I plugged my phone charger into the usb port to check for power and there is definitely no power to the sign power port. I'm at a loss.