A-Body Round #2- My '76 Scamp restore...

And now the same issue is back. Headlights work fine if the turn signal/front marker light ground is unhooked. As soon as I connect the ground for the marker Lights the headlights stop working.

Even tried running an isolated ground wire from the front marker light wire all the way back to the battery in the trunk as a test and same results. Confused. Maybe I have a broken wire crossing somewhere inside the rewrapped harness? Not sure what to do now except get new sockets for the marker lights/front turn signals and rebuild that portion of the harness.

Guess I'll keep moving on other stuff and add this to my list once I've been able to think on it some more.

I would go back to that ground screw and make sure it is making a good connection. Sounds like maybe it isn't getting a good ground so it has to back feed. But there are people way much smarter than I on this.

Maybe @slantsixdan?