Hello everyone. I am new here, just bought my f450 for my lawn buisness work truck. I have no marker lights. Or tail lights. When I turn the marker lights on, pass front comes on and clearence lights. No others, I've checked voltage at the ones that don't work, zero voltage. I've also tried other lights. Headlights,brakelights, cab clearence lights,blinkers all work fine. . I'm stumped