Not Ranked
I am not that familiar with the Backdraft setup but does your low beams have a separate ground from the high beams? Also have you tried checking the voltage at the back of the lights where it would go in for the low beams or is yours to hard to to get to? When I built my Cobra that I had, I ran separate wires and grounds as I raced it and wanted to be sure that I had a back up in case one failed. Also I had a small terminal mounted close to all of my lights where the wiring went to and that made it easy to check for voltage. And also check your light switch as I had one go bad once for the low beams and I suddenly had no light at all when switching to low beam. Hope this gives you some ideas.
Ron
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