2002 Coleman Utah and none of the exterior trailer lights work (clearance, brake, turn signals). Wires at the tongue look in great shape. No crimped, kinked, or damaged wires at all that I can see. The 7 pin connector was very weathered and worn, so I replaced it with a brand new connector. Plugged it in to my TV and got no lights. Double checked TV plug, and all pins are working properly. Did some quick troubleshooting. Tested connectivity between ground pin and trailer frame. No connection there. Also checked connectivity from pin to pin on trailer pigtail. I get signal between ground, RH and LH blinker pins,like all 3 are connected together. So yeah. That's a problem... Any pointers or common problem points to check would be helpful. Where is the main ground connection supposed to be? Figured I'd check that first. It appears that the wires run through the trailer frame, so hard to tell where they come out..