Best guess, the ground wasn’t really grounded because the plastic relay was insulating it on that side. So the power was back feeding through the other circuits.
I had something similar happen when I added relays.
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.