Systems and method are disclosed for inconspicuously providing power to one or more electronic displays of a vehicle top unit from a power source located outside the vehicle top unit. The vehicle top unit is mounted to a first and second cross bar mounted to a roof of a vehicle. Wiring extends from the power source, along a portion of the vehicle, along or through at least one of the first and second cross bars, and to the vehicle top unit. A securing device secures the wiring to the portion of the vehicle.