[gmachinz]

I just starting replicating new rear lamp harnesses and the harness on my 86 K10 has its tail light ground inside the LH tail lamp pocket on the inner box structure. All the grounds for the side markers and turn signal bulbs share this rather inadequate 16ga ground. On my own truck builds, I stud weld a 10mm stud to the rear frame and from there I run my rear bulb grounds as well as grounding the box too from underneath....so I retain the original tail lamp ground but with a 14ga wire and I run my grounds to my grounding stud on frame which then has a lead running to a floor brace of the box with a self grounding serraded machine screw.