Swany

I Have A 93 Legacy Wagon With No Tail Lights. My Tail Lights & Front Side Marker Lights Will Not Stay On. I Can Install A New Fuse And They Will Stay On For A Short Time. Once I Start Driving The Fuse Blows. I Tried Following The Wiring From Tail Lights & License Plate Light To Front And Could Not See Any Visible Problems. Does Anyone Have Any Advice On What May Be The Problem??? Thanks, Swany