Good day everyone! So I've stumbled into another (hopefully) minor problem. I just got my new tail light housing from OldBritts, which is absolutely beautiful. I was installing it on my 1974 commando and have a wiring issue that I didn't have before. When everything is hooked up, the tail light doesn't light up, but the brake light lights up fine when the levers are pulled. Both turn indicators work fine as well. I have the red wire from the harness grounded to the frame. I tested continuity on all the leads from the harness and they all check out fine. I suspect a grounding issue, but would think if that was the case the brake light wouldn't work. Any ideas from the pros?