keep blowing left tail light fuse 93 sts

hi guys i keep blowing my left tail light fuse on my 93 sts. i keep losing the dash and instrument lights at the same time. the new fuse is fine till i take the car out of park,into reverse then boom there goes another fuse.and no more dash lights or left tail lamp. i have already replaced all left bulbs and sockets, as well as both sides reverse bulbs and sockets .what to do? thanks in advance for all input.help!