when I was finishing up on the lighting over the winter I had everything working. Brake lights, tailights, turn signals, emg flashers, backup lights. I encountered a grounding problem with the sport lamps and ran an extra ground wire to them .Problem solved, Then I began to blow out back up lights but not at the same time. replaced bulbs. Turn signals quit, bulbs all good. all marker and tailights began to dim. again adding a ground wire to one rear sidemarker brought back brightness to all bulbs. still no turn signals either showing up on dashboard nor outside 4 corners. flashers work great !, as do the brake lights. backup lights are DOA. tried the light tester with key on and trans in reverse with engine off. no current flow was showing. . retightened all factory grounds and scraped paint from under them but nothing changes. Pulled steering wheel to check TS cam. cleaned contacts, still nothing. I hate to buy a new TS harness only to find out that wasn't the problem because back ups also not working. are these tied in together ? Is there a second flasher under dash because while testing the flasher out with the light tester I would hear a click once or twice under the dash with key on and turn signal arm in the down position but it wasn't coming from the flasher I was holding on to !