I've got a tail light issue that I've been slowly trying to figure out and I need to tap into everyone's collective experience. I had an aftermarket bumper fabbed up a while ago by a local shop. I kept my factory rear bumper lights, which are working just fine. However, none of my rear lights work now. No turn signals, no brakes, nothin. Only the bumper lights work. Normally, I would say this is an issue for the shop that did the work. But, after a terrible experience and a mediocre build on the bumper, AND not finishing all the work I paid them for, they've stopped returning my calls. So, I'm left to figure this out. Any idea on what the issue could be? Electrical work is like the black arts to me, so aside from checking fuses and replacing bulbs, I'm at a loss. Thanks for any help!