Blowing #4 Fuse/ No Tail lights, Cluster, Parking Lights, License Plate light

Don't use fuses to determine if a circuit is good. Use the "ohms" setting on a cheap, digital volt meter. Most have a beeper setting when the leads are touched together. Clip one lead to the fuse socket side that goes to the lights, and the other lead to a good ground. Keep unplugging until it stops beeping to help you find where the problem is.