Need some turn signal school

You didnt say what year and model. I believe Allpar.com has wiring schematics for some cars that you can download. See if you can get those and a DVM and start tracing the signals. Google it if Allpar doesn't have it. If its a 68 or 69 Dart I have that one. Does it have the original harness because that will help a lot tracing this stuff out.