I'm a couple days behind, but if you haven't figured out your issue check the harness itself. My center light wouldn't work, turned out the wires weren't crimped correctly. I tugged on the connection and found the insulation was the only thing crimped. Checked the other crimps, quite a few were loose. Ended up redoing most of them - everything works properly now. I'm grounded to the ground bolt in the passenger kick-panel and all works correctly.