I just acquired a beautiful 65 GTO restomod: FiTech-equipped built 406 Chevy smallblock, QA1 suspension, Tremec 5-speed. The front turn signals work fine. The rears seem possessed. My wife noticed they weren't working. With both bulbs removed and checking the sockets with a test light both sides flash appropriately. With the bulbs in the sockets but not installed in the bezels when I move the lever for a left turn the right bulb flashes and with the lever in the right turn position the left bulb flashes. The sockets looked old and wouldn't stay in the bezels so I replaced them. Turns out the new sockets don't fit any more securely in the bezels than the old ones. The car has a high end stereo and much of the wiring is new American Autowire. Any thoughts?