My left tail lights and side markers are not working.  The right ones work fine.  I checked the fuses, bought another tail light assembly.  Still no luck.  I finally used a jumper from the right side to the left side and the tail light and side lights worked.  After 3 days and rain, the fuses blew.  Any help will be appreciated. 
Kent

Worked to try to fix for a couple of hours today.  Took the rear bumper off.  Traced the wiring harness to the front.  No noticable frays in the wiring.  At my wits end. Help!!!
Kent

I finally used a jumper from the right side to the left side and the tail light and side lights worked.

This pretty much points to a problem within the wiring harmess

 After 3 days and rain, the fuses blew.

And so does this.

Open the harness up or take it to an auto electrician - if you've traced the harness to the front, removing it and "untaping" it should not be a that much of challenge

Thanks, I was hoping it would be less time consuming.