Whats the project today

Thinking bout changing the wiring harness on the Dart,lost all my lights and just get a crackling sound from the headlight switch .blows the 20A fuse for the rear lamps even with the rear harness unplugged .I have been going over it inch by inch and cannot locate the source.already tried swapping the headlamp switch so since I have a spare harness I figure I'll just swap that out.Wish me luck !