2002 f350 headlight issue
 

I had some knock off blue lights from ebay about 2 yrs ago that burned out something in my wiring. I can sometimes change a fuse and that works for very limited amount of time until it blows again. Indicating to me that there is a short from burning or slpit whatever. Also this light only not working in the low beams, in high beams both work. I have cut the plug off which i thought was the orginal problem but did not fix the problem. Does anyone have any suggestions on where to start or what part of the harness might be affected? any and all help is much apprecaited.