Taillights won't turn on
 

I'm driving an 02 is300 and I've found the issue to be my passenger fog light wires are completely shredded to bits. How do I go about replacing them? Can I just use any ole line load copper ground to complete the circircut so my taillights get the grounded juice they need?
https://cimg7.ibsrv.net/gimg/www.clu...75f2522073.jpg
https://cimg0.ibsrv.net/gimg/www.clu...19b295d701.jpg