The new bulbs I received is quite larger than what I expected from the original ones currently installed. However, my question is: what needs to be done if the L.E.D. bulbs do not light on when I installed them in my cars license plate lamp circuit. What I did is tested to see if the bulbs were working with my trunk lamps and they worked. Then with the circuit live I installed the L.E.D.'s in the license plate circuit and was unscucessful in lighting these bulbs up.