New forum member who just bought a '78 El Camino for my son. I'm trying to figure out a problem so we can get it inspected and road-worthy. The issue is that whenever we put on a left turn signal, both rear lights flash. However, when we put on the right turn signal, everything works as expected. This happens whether headlights are on or off. I've checked grounds in the rear (actually removed grounds, grinded rust off and resecured). Also, I've noticed that the left turn signal on the dash doesn't work, however, the front signal works. Any ideas of where to look would be most appreciated.